2155410021361 has 8 divisors (see below), whose sum is σ = 2178130635200. Its totient is φ = 2132723913552.

The previous prime is 2155410021343. The next prime is 2155410021367. The reversal of 2155410021361 is 1631200145512.

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

It is a cyclic number.

It is not a de Polignac number, because 2155410021361 - 2²³ = 2155401632753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2155410021367) 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, 8500911 + ... + 8750788.

It is an arithmetic number, because the mean of its divisors is an integer number (272266329400).

Almost surely, 2^{2155410021361} is an apocalyptic number.

It is an amenable number.

2155410021361 is a deficient number, since it is larger than the sum of its proper divisors (22720613839).

2155410021361 is a wasteful number, since it uses less digits than its factorization.

2155410021361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17253015.

The product of its (nonzero) digits is 7200, while the sum is 31.

Adding to 2155410021361 its reverse (1631200145512), we get a palindrome (3786610166873).

The spelling of 2155410021361 in words is "two trillion, one hundred fifty-five billion, four hundred ten million, twenty-one thousand, three hundred sixty-one".