21221011210122 has 48 divisors (see below), whose sum is σ = 48759209815680. Its totient is φ = 6647218160256.

The previous prime is 21221011210057. The next prime is 21221011210151. The reversal of 21221011210122 is 22101211012212.

21221011210122 is a `hidden beast` number, since 212 + 210 + 1 + 121 + 0 + 122 = 666.

It is a super-6 number, since 6×21221011210122⁶ (a number of 81 digits) contains 666666 as substring.

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 = 21221011210095 and 21221011210104.

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, 53729922 + ... + 54123437.

It is an arithmetic number, because the mean of its divisors is an integer number (1015816871160).

Almost surely, 2^{21221011210122} is an apocalyptic number.

21221011210122 is an abundant number, since it is smaller than the sum of its proper divisors (27538198605558).

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

21221011210122 is a wasteful number, since it uses less digits than its factorization.

21221011210122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107854027 (or 107854024 counting only the distinct ones).

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

Adding to 21221011210122 its reverse (22101211012212), we get a palindrome (43322222222334).

The spelling of 21221011210122 in words is "twenty-one trillion, two hundred twenty-one billion, eleven million, two hundred ten thousand, one hundred twenty-two".