21971350326 has 24 divisors (see below), whose sum is σ = 44045343864. Its totient is φ = 7306716000.

The previous prime is 21971350319. The next prime is 21971350339. The reversal of 21971350326 is 62305317912.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1146826 + ... + 1165826.

It is an arithmetic number, because the mean of its divisors is an integer number (1835222661).

Almost surely, 2^21971350326 is an apocalyptic number.

21971350326 is an abundant number, since it is smaller than the sum of its proper divisors (22073993538).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21971350326 is an equidigital number, since it uses as much as digits as its factorization.

21971350326 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19884 (or 19445 counting only the distinct ones).

The product of its (nonzero) digits is 68040, while the sum is 39.

The spelling of 21971350326 in words is "twenty-one billion, nine hundred seventy-one million, three hundred fifty thousand, three hundred twenty-six".