21716502653620 has 48 divisors (see below), whose sum is σ = 45769090308480. Its totient is φ = 8655299812224.

The previous prime is 21716502653609. The next prime is 21716502653623. The reversal of 21716502653620 is 2635620561712.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21716502653623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17113626 + ... + 18338734.

It is an arithmetic number, because the mean of its divisors is an integer number (953522714760).

Almost surely, 2^{21716502653620} is an apocalyptic number.

21716502653620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21716502653620 is an abundant number, since it is smaller than the sum of its proper divisors (24052587654860).

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

21716502653620 is a wasteful number, since it uses less digits than its factorization.

21716502653620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1228312 (or 1228310 counting only the distinct ones).

The product of its (nonzero) digits is 907200, while the sum is 46.

The spelling of 21716502653620 in words is "twenty-one trillion, seven hundred sixteen billion, five hundred two million, six hundred fifty-three thousand, six hundred twenty".