21011230013121 has 12 divisors (see below), whose sum is σ = 30351980455680. Its totient is φ = 14006366986680.

The previous prime is 21011230013113. The next prime is 21011230013131. The reversal of 21011230013121 is 12131003211012.

21011230013121 is a `hidden beast` number, since 210 + 1 + 1 + 2 + 300 + 131 + 21 = 666.

It is not a de Polignac number, because 21011230013121 - 2³ = 21011230013113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21011230013094 and 21011230013103.

It is not an unprimeable number, because it can be changed into a prime (21011230013131) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 93188541 + ... + 93413738.

It is an arithmetic number, because the mean of its divisors is an integer number (2529331704640).

Almost surely, 2^{21011230013121} is an apocalyptic number.

It is an amenable number.

21011230013121 is a deficient number, since it is larger than the sum of its proper divisors (9340750442559).

21011230013121 is a wasteful number, since it uses less digits than its factorization.

21011230013121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186614796 (or 186614793 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

Adding to 21011230013121 its reverse (12131003211012), we get a palindrome (33142233224133).

The spelling of 21011230013121 in words is "twenty-one trillion, eleven billion, two hundred thirty million, thirteen thousand, one hundred twenty-one".