21153352918 has 8 divisors (see below), whose sum is σ = 31979872512. Its totient is φ = 10493395416.

The previous prime is 21153352901. The next prime is 21153352921. The reversal of 21153352918 is 81925335112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21153352918² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41640205 + ... + 41640712.

It is an arithmetic number, because the mean of its divisors is an integer number (3997484064).

Almost surely, 2^21153352918 is an apocalyptic number.

21153352918 is a deficient number, since it is larger than the sum of its proper divisors (10826519594).

21153352918 is a wasteful number, since it uses less digits than its factorization.

21153352918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83281046.

The product of its digits is 64800, while the sum is 40.

The spelling of 21153352918 in words is "twenty-one billion, one hundred fifty-three million, three hundred fifty-two thousand, nine hundred eighteen".