121556031537153 has 4 divisors (see below), whose sum is σ = 162074708716208. Its totient is φ = 81037354358100.

The previous prime is 121556031537091. The next prime is 121556031537169. The reversal of 121556031537153 is 351735130655121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 121556031537153 - 2⁶ = 121556031537089 is a prime.

It is a super-2 number, since 2×121556031537153² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121556031535153) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20259338589523 + ... + 20259338589528.

It is an arithmetic number, because the mean of its divisors is an integer number (40518677179052).

Almost surely, 2^{121556031537153} is an apocalyptic number.

It is an amenable number.

121556031537153 is a deficient number, since it is larger than the sum of its proper divisors (40518677179055).

121556031537153 is an equidigital number, since it uses as much as digits as its factorization.

121556031537153 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40518677179054.

The product of its (nonzero) digits is 1417500, while the sum is 48.

The spelling of 121556031537153 in words is "one hundred twenty-one trillion, five hundred fifty-six billion, thirty-one million, five hundred thirty-seven thousand, one hundred fifty-three".