21721131322 has 96 divisors (see below), whose sum is σ = 39527429760. Its totient is φ = 8903664000.

The previous prime is 21721131307. The next prime is 21721131337. The reversal of 21721131322 is 22313112712.

It is an interprime number because it is at equal distance from previous prime (21721131307) and next prime (21721131337).

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 47 ways as a sum of consecutive naturals, for example, 30985572 + ... + 30986272.

It is an arithmetic number, because the mean of its divisors is an integer number (411744060).

Almost surely, 2^21721131322 is an apocalyptic number.

21721131322 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21721131322 is a deficient number, since it is larger than the sum of its proper divisors (17806298438).

21721131322 is a wasteful number, since it uses less digits than its factorization.

21721131322 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1060 (or 1049 counting only the distinct ones).

The product of its digits is 1008, while the sum is 25.

The spelling of 21721131322 in words is "twenty-one billion, seven hundred twenty-one million, one hundred thirty-one thousand, three hundred twenty-two".