21255253653363 has 4 divisors (see below), whose sum is σ = 28340338204488. Its totient is φ = 14170169102240.

The previous prime is 21255253653329. The next prime is 21255253653401. The reversal of 21255253653363 is 36335635255212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21255253653363 - 2⁶ = 21255253653299 is a prime.

It is a super-2 number, since 2×21255253653363² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21255253651363) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3542542275558 + ... + 3542542275563.

It is an arithmetic number, because the mean of its divisors is an integer number (7085084551122).

Almost surely, 2^{21255253653363} is an apocalyptic number.

21255253653363 is a deficient number, since it is larger than the sum of its proper divisors (7085084551125).

21255253653363 is an equidigital number, since it uses as much as digits as its factorization.

21255253653363 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7085084551124.

The product of its digits is 14580000, while the sum is 51.

The spelling of 21255253653363 in words is "twenty-one trillion, two hundred fifty-five billion, two hundred fifty-three million, six hundred fifty-three thousand, three hundred sixty-three".