21352013331 has 8 divisors (see below), whose sum is σ = 31057473984. Its totient is φ = 12940614120.

The previous prime is 21352013327. The next prime is 21352013339. The reversal of 21352013331 is 13331025312.

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

It is not a de Polignac number, because 21352013331 - 2² = 21352013327 is a prime.

It is a super-2 number, since 2×21352013331² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21352013339) 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, 323515321 + ... + 323515386.

It is an arithmetic number, because the mean of its divisors is an integer number (3882184248).

Almost surely, 2^21352013331 is an apocalyptic number.

21352013331 is a deficient number, since it is larger than the sum of its proper divisors (9705460653).

21352013331 is a wasteful number, since it uses less digits than its factorization.

21352013331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 647030721.

The product of its (nonzero) digits is 1620, while the sum is 24.

Adding to 21352013331 its reverse (13331025312), we get a palindrome (34683038643).

The spelling of 21352013331 in words is "twenty-one billion, three hundred fifty-two million, thirteen thousand, three hundred thirty-one".