21745555375707 has 8 divisors (see below), whose sum is σ = 32215637593680. Its totient is φ = 14497036917120.

The previous prime is 21745555375693. The next prime is 21745555375729. The reversal of 21745555375707 is 70757355554712.

21745555375707 is a `hidden beast` number, since 2 + 1 + 7 + 4 + 5 + 5 + 5 + 53 + 7 + 570 + 7 = 666.

It is not a de Polignac number, because 21745555375707 - 2¹⁵ = 21745555342939 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21745555305707) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 402695469894 + ... + 402695469947.

It is an arithmetic number, because the mean of its divisors is an integer number (4026954699210).

Almost surely, 2^{21745555375707} is an apocalyptic number.

21745555375707 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

21745555375707 is a deficient number, since it is larger than the sum of its proper divisors (10470082217973).

21745555375707 is an equidigital number, since it uses as much as digits as its factorization.

21745555375707 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 805390939850 (or 805390939844 counting only the distinct ones).

The product of its (nonzero) digits is 180075000, while the sum is 63.

The spelling of 21745555375707 in words is "twenty-one trillion, seven hundred forty-five billion, five hundred fifty-five million, three hundred seventy-five thousand, seven hundred seven".