21912373351 has 8 divisors (see below), whose sum is σ = 24003598608. Its totient is φ = 19837680000.

The previous prime is 21912373339. The next prime is 21912373387. The reversal of 21912373351 is 15337321912.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21912373351 - 2¹¹ = 21912371303 is a prime.

It is a super-2 number, since 2×21912373351² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21912373351.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21912373391) 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, 4130200 + ... + 4135501.

It is an arithmetic number, because the mean of its divisors is an integer number (3000449826).

Almost surely, 2^21912373351 is an apocalyptic number.

21912373351 is a deficient number, since it is larger than the sum of its proper divisors (2091225257).

21912373351 is a wasteful number, since it uses less digits than its factorization.

21912373351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8265953.

The product of its digits is 34020, while the sum is 37.

The spelling of 21912373351 in words is "twenty-one billion, nine hundred twelve million, three hundred seventy-three thousand, three hundred fifty-one".