21153251362 has 4 divisors (see below), whose sum is σ = 31729877046. Its totient is φ = 10576625680.

The previous prime is 21153251359. The next prime is 21153251387. The reversal of 21153251362 is 26315235112.

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., 15205602721 + 5947648641 = 123311^2 + 77121^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5288312839 + ... + 5288312842.

Almost surely, 2^21153251362 is an apocalyptic number.

21153251362 is a deficient number, since it is larger than the sum of its proper divisors (10576625684).

21153251362 is a wasteful number, since it uses less digits than its factorization.

21153251362 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10576625683.

The product of its digits is 10800, while the sum is 31.

Adding to 21153251362 its reverse (26315235112), we get a palindrome (47468486474).

The spelling of 21153251362 in words is "twenty-one billion, one hundred fifty-three million, two hundred fifty-one thousand, three hundred sixty-two".