21211101012222 has 64 divisors (see below), whose sum is σ = 51708118521600. Its totient is φ = 6391697919840.

The previous prime is 21211101012221. The next prime is 21211101012259. The reversal of 21211101012222 is 22221010111212.

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 = 21211101012195 and 21211101012204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21211101012221) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 99639273 + ... + 99851924.

It is an arithmetic number, because the mean of its divisors is an integer number (807939351900).

Almost surely, 2^{21211101012222} is an apocalyptic number.

21211101012222 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21211101012222 is an abundant number, since it is smaller than the sum of its proper divisors (30497017509378).

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

21211101012222 is a wasteful number, since it uses less digits than its factorization.

21211101012222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199491398 (or 199491392 counting only the distinct ones).

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

Adding to 21211101012222 its reverse (22221010111212), we get a palindrome (43432111123434).

The spelling of 21211101012222 in words is "twenty-one trillion, two hundred eleven billion, one hundred one million, twelve thousand, two hundred twenty-two".