121557107265 has 32 divisors (see below), whose sum is σ = 213238656000. Its totient is φ = 58640598720.

The previous prime is 121557107201. The next prime is 121557107297. The reversal of 121557107265 is 562701755121.

It is not a de Polignac number, because 121557107265 - 2⁶ = 121557107201 is a prime.

It is a super-2 number, since 2×121557107265² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1818195 + ... + 1883864.

It is an arithmetic number, because the mean of its divisors is an integer number (6663708000).

Almost surely, 2^121557107265 is an apocalyptic number.

121557107265 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

121557107265 is a deficient number, since it is larger than the sum of its proper divisors (91681548735).

121557107265 is a wasteful number, since it uses less digits than its factorization.

121557107265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3702277.

The product of its (nonzero) digits is 147000, while the sum is 42.

It can be divided in two parts, 121557 and 107265, that added together give a palindrome (228822).

The spelling of 121557107265 in words is "one hundred twenty-one billion, five hundred fifty-seven million, one hundred seven thousand, two hundred sixty-five".