21146530256601 has 16 divisors (see below), whose sum is σ = 29503777051584. Its totient is φ = 13457863209024.

The previous prime is 21146530256567. The next prime is 21146530256617. The reversal of 21146530256601 is 10665203564112.

It is not a de Polignac number, because 21146530256601 - 2²⁶ = 21146463147737 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21146530956601) 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, 1797251491 + ... + 1797263256.

It is an arithmetic number, because the mean of its divisors is an integer number (1843986065724).

Almost surely, 2^{21146530256601} is an apocalyptic number.

It is an amenable number.

21146530256601 is a deficient number, since it is larger than the sum of its proper divisors (8357246794983).

21146530256601 is a wasteful number, since it uses less digits than its factorization.

21146530256601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3594514840.

The product of its (nonzero) digits is 259200, while the sum is 42.

The spelling of 21146530256601 in words is "twenty-one trillion, one hundred forty-six billion, five hundred thirty million, two hundred fifty-six thousand, six hundred one".