21601673121245 has 16 divisors (see below), whose sum is σ = 29641993835520. Its totient is φ = 14804154791424.

The previous prime is 21601673121233. The next prime is 21601673121337. The reversal of 21601673121245 is 54212137610612.

It is a cyclic number.

It is not a de Polignac number, because 21601673121245 - 2⁴ = 21601673121229 is a prime.

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, 175376372 + ... + 175499501.

It is an arithmetic number, because the mean of its divisors is an integer number (1852624614720).

Almost surely, 2^{21601673121245} is an apocalyptic number.

It is an amenable number.

21601673121245 is a deficient number, since it is larger than the sum of its proper divisors (8040320714275).

21601673121245 is a wasteful number, since it uses less digits than its factorization.

21601673121245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 350877644.

The product of its (nonzero) digits is 120960, while the sum is 41.

The spelling of 21601673121245 in words is "twenty-one trillion, six hundred one billion, six hundred seventy-three million, one hundred twenty-one thousand, two hundred forty-five".