21320620351 has 8 divisors (see below), whose sum is σ = 21544218864. Its totient is φ = 21097267200.

The previous prime is 21320620333. The next prime is 21320620361. The reversal of 21320620351 is 15302602312.

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 21320620351 - 2⁵ = 21320620319 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21320620361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 116031 + ... + 236863.

It is an arithmetic number, because the mean of its divisors is an integer number (2693027358).

Almost surely, 2^21320620351 is an apocalyptic number.

21320620351 is a deficient number, since it is larger than the sum of its proper divisors (223598513).

21320620351 is a wasteful number, since it uses less digits than its factorization.

21320620351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122681.

The product of its (nonzero) digits is 2160, while the sum is 25.

The spelling of 21320620351 in words is "twenty-one billion, three hundred twenty million, six hundred twenty thousand, three hundred fifty-one".