21745757616215 has 16 divisors (see below), whose sum is σ = 26230503000288. Its totient is φ = 17306212847616.

The previous prime is 21745757616169. The next prime is 21745757616283. The reversal of 21745757616215 is 51261675754712.

It is a cyclic number.

It is not a de Polignac number, because 21745757616215 - 2¹² = 21745757612119 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 91340924 + ... + 91578686.

It is an arithmetic number, because the mean of its divisors is an integer number (1639406437518).

Almost surely, 2^{21745757616215} is an apocalyptic number.

21745757616215 is a deficient number, since it is larger than the sum of its proper divisors (4484745384073).

21745757616215 is a wasteful number, since it uses less digits than its factorization.

21745757616215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332738.

The product of its digits is 24696000, while the sum is 59.

The spelling of 21745757616215 in words is "twenty-one trillion, seven hundred forty-five billion, seven hundred fifty-seven million, six hundred sixteen thousand, two hundred fifteen".