21012202022121 has 16 divisors (see below), whose sum is σ = 31374299904000. Its totient is φ = 13897834406064.

The previous prime is 21012202022107. The next prime is 21012202022177. The reversal of 21012202022121 is 12122020221012.

It is a happy number.

21012202022121 is a `hidden beast` number, since 210 + 1 + 220 + 20 + 2 + 212 + 1 = 666.

It is not a de Polignac number, because 21012202022121 - 2³⁵ = 20977842283753 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21012202022094 and 21012202022103.

It is not an unprimeable number, because it can be changed into a prime (21012202022521) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3063893046 + ... + 3063899903.

It is an arithmetic number, because the mean of its divisors is an integer number (1960893744000).

Almost surely, 2^{21012202022121} is an apocalyptic number.

It is an amenable number.

21012202022121 is a deficient number, since it is larger than the sum of its proper divisors (10362097881879).

21012202022121 is a wasteful number, since it uses less digits than its factorization.

21012202022121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6127793085 (or 6127793079 counting only the distinct ones).

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

Adding to 21012202022121 its reverse (12122020221012), we get a palindrome (33134222243133).

The spelling of 21012202022121 in words is "twenty-one trillion, twelve billion, two hundred two million, twenty-two thousand, one hundred twenty-one".