21516631262 has 16 divisors (see below), whose sum is σ = 36910494720. Its totient is φ = 9215203128.

The previous prime is 21516631231. The next prime is 21516631267. The reversal of 21516631262 is 26213661512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21516631267) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 495962 + ... + 537597.

It is an arithmetic number, because the mean of its divisors is an integer number (2306905920).

Almost surely, 2^21516631262 is an apocalyptic number.

21516631262 is a deficient number, since it is larger than the sum of its proper divisors (15393863458).

21516631262 is a wasteful number, since it uses less digits than its factorization.

21516631262 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1035055.

The product of its digits is 25920, while the sum is 35.

The spelling of 21516631262 in words is "twenty-one billion, five hundred sixteen million, six hundred thirty-one thousand, two hundred sixty-two".