2163451623621 has 16 divisors (see below), whose sum is σ = 3054490171200. Its totient is φ = 1357368497408.

The previous prime is 2163451623569. The next prime is 2163451623637. The reversal of 2163451623621 is 1263261543612.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2163451623621 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2163451623661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 657906 + ... + 2181683.

It is an arithmetic number, because the mean of its divisors is an integer number (190905635700).

Almost surely, 2^{2163451623621} is an apocalyptic number.

It is an amenable number.

2163451623621 is a deficient number, since it is larger than the sum of its proper divisors (891038547579).

2163451623621 is a wasteful number, since it uses less digits than its factorization.

2163451623621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2854548.

The product of its digits is 311040, while the sum is 42.

The spelling of 2163451623621 in words is "two trillion, one hundred sixty-three billion, four hundred fifty-one million, six hundred twenty-three thousand, six hundred twenty-one".