2151235121255 has 12 divisors (see below), whose sum is σ = 2837496904536. Its totient is φ = 1564534633200.

The previous prime is 2151235121219. The next prime is 2151235121381. The reversal of 2151235121255 is 5521215321512.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-2151235121255 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1777879661 + ... + 1777880870.

It is an arithmetic number, because the mean of its divisors is an integer number (236458075378).

Almost surely, 2^{2151235121255} is an apocalyptic number.

2151235121255 is a deficient number, since it is larger than the sum of its proper divisors (686261783281).

2151235121255 is a wasteful number, since it uses less digits than its factorization.

2151235121255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3555760558 (or 3555760547 counting only the distinct ones).

The product of its digits is 30000, while the sum is 35.

The spelling of 2151235121255 in words is "two trillion, one hundred fifty-one billion, two hundred thirty-five million, one hundred twenty-one thousand, two hundred fifty-five".