2155654634321 has 4 divisors (see below), whose sum is σ = 2155854780144. Its totient is φ = 2155454488500.

The previous prime is 2155654634299. The next prime is 2155654634363. The reversal of 2155654634321 is 1234364565512.

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 a cyclic number.

It is not a de Polignac number, because 2155654634321 - 2¹⁸ = 2155654372177 is a prime.

It is a super-2 number, since 2×2155654634321² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2155654634381) 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, 100056755 + ... + 100078296.

It is an arithmetic number, because the mean of its divisors is an integer number (538963695036).

Almost surely, 2^{2155654634321} is an apocalyptic number.

It is an amenable number.

2155654634321 is a deficient number, since it is larger than the sum of its proper divisors (200145823).

2155654634321 is a wasteful number, since it uses less digits than its factorization.

2155654634321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200145822.

The product of its digits is 2592000, while the sum is 47.

The spelling of 2155654634321 in words is "two trillion, one hundred fifty-five billion, six hundred fifty-four million, six hundred thirty-four thousand, three hundred twenty-one".