21612520122617 has 16 divisors (see below), whose sum is σ = 22904483374080. Its totient is φ = 20357065680000.

The previous prime is 21612520122607. The next prime is 21612520122619. The reversal of 21612520122617 is 71622102521612.

It is a cyclic number.

It is not a de Polignac number, because 21612520122617 - 2²⁸ = 21612251687161 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21612520122619) 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, 19315742 + ... + 20403992.

It is an arithmetic number, because the mean of its divisors is an integer number (1431530210880).

Almost surely, 2^{21612520122617} is an apocalyptic number.

It is an amenable number.

21612520122617 is a deficient number, since it is larger than the sum of its proper divisors (1291963251463).

21612520122617 is a wasteful number, since it uses less digits than its factorization.

21612520122617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1105024.

The product of its (nonzero) digits is 40320, while the sum is 38.

The spelling of 21612520122617 in words is "twenty-one trillion, six hundred twelve billion, five hundred twenty million, one hundred twenty-two thousand, six hundred seventeen".