21211210011222 has 160 divisors (see below), whose sum is σ = 59317029471744. Its totient is φ = 5503797331200.

The previous prime is 21211210011053. The next prime is 21211210011223. The reversal of 21211210011222 is 22211001211212.

21211210011222 is a `hidden beast` number, since 21 + 211 + 210 + 0 + 1 + 1 + 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 = 21211210011195 and 21211210011204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21211210011223) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 11397022 + ... + 13126862.

Almost surely, 2^{21211210011222} is an apocalyptic number.

21211210011222 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 21211210011222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29658514735872).

21211210011222 is an abundant number, since it is smaller than the sum of its proper divisors (38105819460522).

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

21211210011222 is a wasteful number, since it uses less digits than its factorization.

21211210011222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1730856 (or 1730847 counting only the distinct ones).

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

Adding to 21211210011222 its reverse (22211001211212), we get a palindrome (43422211222434).

The spelling of 21211210011222 in words is "twenty-one trillion, two hundred eleven billion, two hundred ten million, eleven thousand, two hundred twenty-two".