21313514553 has 16 divisors (see below), whose sum is σ = 28671062016. Its totient is φ = 14082915600.

The previous prime is 21313514527. The next prime is 21313514587. The reversal of 21313514553 is 35541531312.

It is not a de Polignac number, because 21313514553 - 2²¹ = 21311417401 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21313514153) 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, 147576 + ... + 253782.

It is an arithmetic number, because the mean of its divisors is an integer number (1791941376).

Almost surely, 2^21313514553 is an apocalyptic number.

It is an amenable number.

21313514553 is a deficient number, since it is larger than the sum of its proper divisors (7357547463).

21313514553 is a wasteful number, since it uses less digits than its factorization.

21313514553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106804.

The product of its digits is 27000, while the sum is 33.

The spelling of 21313514553 in words is "twenty-one billion, three hundred thirteen million, five hundred fourteen thousand, five hundred fifty-three".