21201211011222 has 96 divisors (see below), whose sum is σ = 51469910672544. Its totient is φ = 6250536460800.

The previous prime is 21201211011193. The next prime is 21201211011287. The reversal of 21201211011222 is 22211011210212.

21201211011222 is a `hidden beast` number, since 21 + 201 + 211 + 0 + 11 + 222 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21201211011195 and 21201211011204.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 114053538 + ... + 114239274.

It is an arithmetic number, because the mean of its divisors is an integer number (536144902839).

Almost surely, 2^{21201211011222} is an apocalyptic number.

21201211011222 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 21201211011222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25734955336272).

21201211011222 is an abundant number, since it is smaller than the sum of its proper divisors (30268699661322).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21201211011222 is a wasteful number, since it uses less digits than its factorization.

21201211011222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201374 (or 201371 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 21201211011222 its reverse (22211011210212), we get a palindrome (43412222221434).

The spelling of 21201211011222 in words is "twenty-one trillion, two hundred one billion, two hundred eleven million, eleven thousand, two hundred twenty-two".