21652818780620 has 48 divisors (see below), whose sum is σ = 45633261588768. Its totient is φ = 8630207439360.

The previous prime is 21652818780599. The next prime is 21652818780629. The reversal of 21652818780620 is 2608781825612.

It is a super-2 number, since 2×21652818780620² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21652818780629) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 211276190 + ... + 211378650.

It is an arithmetic number, because the mean of its divisors is an integer number (950692949766).

Almost surely, 2^{21652818780620} is an apocalyptic number.

21652818780620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21652818780620 is an abundant number, since it is smaller than the sum of its proper divisors (23980442808148).

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

21652818780620 is a wasteful number, since it uses less digits than its factorization.

21652818780620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140090 (or 140088 counting only the distinct ones).

The product of its (nonzero) digits is 5160960, while the sum is 56.

The spelling of 21652818780620 in words is "twenty-one trillion, six hundred fifty-two billion, eight hundred eighteen million, seven hundred eighty thousand, six hundred twenty".