21113011565254 has 64 divisors (see below), whose sum is σ = 37513706342400. Its totient is φ = 8906425204320.

The previous prime is 21113011565213. The next prime is 21113011565263. The reversal of 21113011565254 is 45256511031112.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 29503207 + ... + 30210349.

It is an arithmetic number, because the mean of its divisors is an integer number (586151661600).

Almost surely, 2^{21113011565254} is an apocalyptic number.

21113011565254 is a deficient number, since it is larger than the sum of its proper divisors (16400694777146).

21113011565254 is an equidigital number, since it uses as much as digits as its factorization.

21113011565254 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 707850 (or 707836 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 37.

Adding to 21113011565254 its reverse (45256511031112), we get a palindrome (66369522596366).

The spelling of 21113011565254 in words is "twenty-one trillion, one hundred thirteen billion, eleven million, five hundred sixty-five thousand, two hundred fifty-four".