121191545618440 has 48 divisors (see below), whose sum is σ = 299723719237740. Its totient is φ = 44069652950400.

The previous prime is 121191545618419. The next prime is 121191545618443. The reversal of 121191545618440 is 44816545191121.

It can be written as a sum of positive squares in 2 ways, for example, as 115227214547236 + 5964331071204 = 10734394^2 + 2442198^2 .

It is not an unprimeable number, because it can be changed into a prime (121191545618443) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12519782931 + ... + 12519792610.

Almost surely, 2^{121191545618440} is an apocalyptic number.

121191545618440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121191545618440 is an abundant number, since it is smaller than the sum of its proper divisors (178532173619300).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121191545618440 is a wasteful number, since it uses less digits than its factorization.

121191545618440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25039575574 (or 25039575559 counting only the distinct ones).

The product of its (nonzero) digits is 1382400, while the sum is 52.

The spelling of 121191545618440 in words is "one hundred twenty-one trillion, one hundred ninety-one billion, five hundred forty-five million, six hundred eighteen thousand, four hundred forty".