21000023022121 has 32 divisors (see below), whose sum is σ = 25148484740736. Its totient is φ = 17284851840000.

The previous prime is 21000023022101. The next prime is 21000023022127. The reversal of 21000023022121 is 12122032000012.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21000023022121 - 2²³ = 21000014633513 is a prime.

It is a super-2 number, since 2×21000023022121² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21000023022095 and 21000023022104.

It is not an unprimeable number, because it can be changed into a prime (21000023022127) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5248960 + ... + 8339761.

It is an arithmetic number, because the mean of its divisors is an integer number (785890148148).

Almost surely, 2^{21000023022121} is an apocalyptic number.

It is an amenable number.

21000023022121 is a deficient number, since it is larger than the sum of its proper divisors (4148461718615).

21000023022121 is a wasteful number, since it uses less digits than its factorization.

21000023022121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13588953.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21000023022121 its reverse (12122032000012), we get a palindrome (33122055022133).

The spelling of 21000023022121 in words is "twenty-one trillion, twenty-three million, twenty-two thousand, one hundred twenty-one".