121557007457 has 8 divisors (see below), whose sum is σ = 122558309376. Its totient is φ = 120556395792.

The previous prime is 121557007423. The next prime is 121557007477. The reversal of 121557007457 is 754700755121.

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 121557007457 - 2¹⁶ = 121556941921 is a prime.

It is a super-2 number, since 2×121557007457² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121557007477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 184118 + ... + 526320.

It is an arithmetic number, because the mean of its divisors is an integer number (15319788672).

Almost surely, 2^121557007457 is an apocalyptic number.

It is an amenable number.

121557007457 is a deficient number, since it is larger than the sum of its proper divisors (1001301919).

121557007457 is a wasteful number, since it uses less digits than its factorization.

121557007457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 345127.

The product of its (nonzero) digits is 343000, while the sum is 44.

The spelling of 121557007457 in words is "one hundred twenty-one billion, five hundred fifty-seven million, seven thousand, four hundred fifty-seven".