21651590903331 has 8 divisors (see below), whose sum is σ = 28868839708864. Its totient is φ = 14434368016680.

The previous prime is 21651590903303. The next prime is 21651590903339. The reversal of 21651590903331 is 13330909515612.

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

It is not a de Polignac number, because 21651590903331 - 2¹⁵ = 21651590870563 is a prime.

It is a super-2 number, since 2×21651590903331² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21651590903339) 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, 4438705 + ... + 7937586.

It is an arithmetic number, because the mean of its divisors is an integer number (3608604963608).

Almost surely, 2^{21651590903331} is an apocalyptic number.

21651590903331 is a deficient number, since it is larger than the sum of its proper divisors (7217248805533).

21651590903331 is a wasteful number, since it uses less digits than its factorization.

21651590903331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12959441.

The product of its (nonzero) digits is 656100, while the sum is 48.

The spelling of 21651590903331 in words is "twenty-one trillion, six hundred fifty-one billion, five hundred ninety million, nine hundred three thousand, three hundred thirty-one".