121972833661 has 16 divisors (see below), whose sum is σ = 142674302848. Its totient is φ = 102091752000.

The previous prime is 121972833641. The next prime is 121972833677. The reversal of 121972833661 is 166338279121.

It is not a de Polignac number, because 121972833661 - 2¹¹ = 121972831613 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121972833641) 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, 1235011 + ... + 1330111.

It is an arithmetic number, because the mean of its divisors is an integer number (8917143928).

Almost surely, 2^121972833661 is an apocalyptic number.

It is an amenable number.

121972833661 is a deficient number, since it is larger than the sum of its proper divisors (20701469187).

121972833661 is an equidigital number, since it uses as much as digits as its factorization.

121972833661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99412.

The product of its digits is 653184, while the sum is 49.

The spelling of 121972833661 in words is "one hundred twenty-one billion, nine hundred seventy-two million, eight hundred thirty-three thousand, six hundred sixty-one".