21631004350 has 36 divisors (see below), whose sum is σ = 41992640424. Its totient is φ = 8274302080.

The previous prime is 21631004267. The next prime is 21631004371. The reversal of 21631004350 is 5340013612.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 4985382 + ... + 4989718.

It is an arithmetic number, because the mean of its divisors is an integer number (1166462234).

Almost surely, 2^21631004350 is an apocalyptic number.

21631004350 is a deficient number, since it is larger than the sum of its proper divisors (20361636074).

21631004350 is an frugal number, since it uses more digits than its factorization.

21631004350 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8709 (or 4367 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 25.

Adding to 21631004350 its reverse (5340013612), we get a palindrome (26971017962).

The spelling of 21631004350 in words is "twenty-one billion, six hundred thirty-one million, four thousand, three hundred fifty".