21375766717120 has 28 divisors (see below), whose sum is σ = 50901044495904. Its totient is φ = 8550306686720.

The previous prime is 21375766717091. The next prime is 21375766717223. The reversal of 21375766717120 is 2171766757312.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33399635176 + ... + 33399635815.

Almost surely, 2^{21375766717120} is an apocalyptic number.

21375766717120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21375766717120 is an abundant number, since it is smaller than the sum of its proper divisors (29525277778784).

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

21375766717120 is an equidigital number, since it uses as much as digits as its factorization.

21375766717120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66799271008 (or 66799270998 counting only the distinct ones).

The product of its (nonzero) digits is 5186160, while the sum is 55.

The spelling of 21375766717120 in words is "twenty-one trillion, three hundred seventy-five billion, seven hundred sixty-six million, seven hundred seventeen thousand, one hundred twenty".