21520611454 has 16 divisors (see below), whose sum is σ = 32499845280. Its totient is φ = 10687453920.

The previous prime is 21520611419. The next prime is 21520611467. The reversal of 21520611454 is 45411602512.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 322807 + ... + 383725.

It is an arithmetic number, because the mean of its divisors is an integer number (2031240330).

Almost surely, 2^21520611454 is an apocalyptic number.

21520611454 is a deficient number, since it is larger than the sum of its proper divisors (10979233826).

21520611454 is a wasteful number, since it uses less digits than its factorization.

21520611454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62115.

The product of its (nonzero) digits is 9600, while the sum is 31.

The spelling of 21520611454 in words is "twenty-one billion, five hundred twenty million, six hundred eleven thousand, four hundred fifty-four".