21131223002 has 4 divisors (see below), whose sum is σ = 31696834506. Its totient is φ = 10565611500.

The previous prime is 21131222999. The next prime is 21131223011. The reversal of 21131223002 is 20032213112.

21131223002 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 21042693721 + 88529281 = 145061^2 + 9409^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5282805749 + ... + 5282805752.

Almost surely, 2^21131223002 is an apocalyptic number.

21131223002 is a deficient number, since it is larger than the sum of its proper divisors (10565611504).

21131223002 is a wasteful number, since it uses less digits than its factorization.

21131223002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10565611503.

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

Adding to 21131223002 its reverse (20032213112), we get a palindrome (41163436114).

The spelling of 21131223002 in words is "twenty-one billion, one hundred thirty-one million, two hundred twenty-three thousand, two".