21311946017220 has 48 divisors (see below), whose sum is σ = 59673670576128. Its totient is φ = 5683164487680.

The previous prime is 21311946017177. The next prime is 21311946017249. The reversal of 21311946017220 is 2271064911312.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22123005 + ... + 23066235.

It is an arithmetic number, because the mean of its divisors is an integer number (1243201470336).

Almost surely, 2^{21311946017220} is an apocalyptic number.

21311946017220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21311946017220 is an abundant number, since it is smaller than the sum of its proper divisors (38361724558908).

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

21311946017220 is a wasteful number, since it uses less digits than its factorization.

21311946017220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1319820 (or 1319818 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 39.

The spelling of 21311946017220 in words is "twenty-one trillion, three hundred eleven billion, nine hundred forty-six million, seventeen thousand, two hundred twenty".