21130333402 has 4 divisors (see below), whose sum is σ = 31695500106. Its totient is φ = 10565166700.

The previous prime is 21130333397. The next prime is 21130333421. The reversal of 21130333402 is 20433303112.

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., 18393055641 + 2737277761 = 135621^2 + 52319^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5282583349 + ... + 5282583352.

Almost surely, 2^21130333402 is an apocalyptic number.

21130333402 is a deficient number, since it is larger than the sum of its proper divisors (10565166704).

21130333402 is a wasteful number, since it uses less digits than its factorization.

21130333402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10565166703.

The product of its (nonzero) digits is 1296, while the sum is 22.

Adding to 21130333402 its reverse (20433303112), we get a palindrome (41563636514).

The spelling of 21130333402 in words is "twenty-one billion, one hundred thirty million, three hundred thirty-three thousand, four hundred two".