21210122022012 has 72 divisors (see below), whose sum is σ = 66844020926592. Its totient is φ = 5509122602400.

The previous prime is 21210122022007. The next prime is 21210122022041. The reversal of 21210122022012 is 21022022101212.

It is a happy number.

21210122022012 is a `hidden beast` number, since 2 + 1 + 210 + 1 + 220 + 220 + 12 = 666.

It is a super-2 number, since 2×21210122022012² (a number of 27 digits) contains 22 as substring.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3825776814 + ... + 3825782357.

It is an arithmetic number, because the mean of its divisors is an integer number (928389179536).

Almost surely, 2^{21210122022012} is an apocalyptic number.

21210122022012 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21210122022012 is an abundant number, since it is smaller than the sum of its proper divisors (45633898904580).

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

21210122022012 is a wasteful number, since it uses less digits than its factorization.

21210122022012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7651559199 (or 7651559194 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21210122022012 its reverse (21022022101212), we get a palindrome (42232144123224).

The spelling of 21210122022012 in words is "twenty-one trillion, two hundred ten billion, one hundred twenty-two million, twenty-two thousand, twelve".