21631002 has 16 divisors (see below), whose sum is σ = 43872192. Its totient is φ = 7108640.

The previous prime is 21630997. The next prime is 21631003. The reversal of 21631002 is 20013612.

It is not an unprimeable number, because it can be changed into a prime (21631003) 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, 24963 + ... + 25814.

It is an arithmetic number, because the mean of its divisors is an integer number (2742012).

Almost surely, 2^21631002 is an apocalyptic number.

21631002 is an abundant number, since it is smaller than the sum of its proper divisors (22241190).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21631002 is a wasteful number, since it uses less digits than its factorization.

21631002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50853.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 21631002 is about 4650.9141037005. The cubic root of 21631002 is about 278.6285057085.

Adding to 21631002 its reverse (20013612), we get a palindrome (41644614).

The spelling of 21631002 in words is "twenty-one million, six hundred thirty-one thousand, two".