121621660564645 has 8 divisors (see below), whose sum is σ = 146094462665856. Its totient is φ = 97198348459536.

The previous prime is 121621660564603. The next prime is 121621660564693. The reversal of 121621660564645 is 546465066126121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121621660564645 - 2¹⁷ = 121621660433573 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 7 ways as a sum of consecutive naturals, for example, 12372493617 + ... + 12372503446.

It is an arithmetic number, because the mean of its divisors is an integer number (18261807833232).

Almost surely, 2^{121621660564645} is an apocalyptic number.

It is an amenable number.

121621660564645 is a deficient number, since it is larger than the sum of its proper divisors (24472802101211).

121621660564645 is an equidigital number, since it uses as much as digits as its factorization.

121621660564645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24744998051.

The product of its (nonzero) digits is 12441600, while the sum is 55.

The spelling of 121621660564645 in words is "one hundred twenty-one trillion, six hundred twenty-one billion, six hundred sixty million, five hundred sixty-four thousand, six hundred forty-five".