21223131002 has 16 divisors (see below), whose sum is σ = 32479720200. Its totient is φ = 10397105472.

The previous prime is 21223131001. The next prime is 21223131031. The reversal of 21223131002 is 20013132212.

It can be written as a sum of positive squares in 4 ways, for example, as 21222953761 + 177241 = 145681^2 + 421^2 .

It is not an unprimeable number, because it can be changed into a prime (21223131001) 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, 58877 + ... + 214272.

Almost surely, 2^21223131002 is an apocalyptic number.

21223131002 is a deficient number, since it is larger than the sum of its proper divisors (11256589198).

21223131002 is a wasteful number, since it uses less digits than its factorization.

21223131002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 273937.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21223131002 its reverse (20013132212), we get a palindrome (41236263214).

The spelling of 21223131002 in words is "twenty-one billion, two hundred twenty-three million, one hundred thirty-one thousand, two".