2131555120121 has 8 divisors (see below), whose sum is σ = 2436088415040. Its totient is φ = 1827028180368.

The previous prime is 2131555120091. The next prime is 2131555120127. The reversal of 2131555120121 is 1210215551312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2131555120121 is a prime.

It is a super-2 number, since 2×2131555120121² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2131555120127) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 846971 + ... + 2231696.

It is an arithmetic number, because the mean of its divisors is an integer number (304511051880).

Almost surely, 2^{2131555120121} is an apocalyptic number.

It is an amenable number.

2131555120121 is a deficient number, since it is larger than the sum of its proper divisors (304533294919).

2131555120121 is an equidigital number, since it uses as much as digits as its factorization.

2131555120121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3177583.

The product of its (nonzero) digits is 3000, while the sum is 29.

The spelling of 2131555120121 in words is "two trillion, one hundred thirty-one billion, five hundred fifty-five million, one hundred twenty thousand, one hundred twenty-one".