2158887514221 has 8 divisors (see below), whose sum is σ = 3198351872960. Its totient is φ = 1439258342796.

The previous prime is 2158887514219. The next prime is 2158887514241. The reversal of 2158887514221 is 1224157888512.

2158887514221 is a `hidden beast` number, since 2 + 1 + 588 + 8 + 7 + 51 + 4 + 2 + 2 + 1 = 666.

It is not a de Polignac number, because 2158887514221 - 2¹ = 2158887514219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2158887514241) 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, 39979398385 + ... + 39979398438.

It is an arithmetic number, because the mean of its divisors is an integer number (399793984120).

Almost surely, 2^{2158887514221} is an apocalyptic number.

It is an amenable number.

2158887514221 is a deficient number, since it is larger than the sum of its proper divisors (1039464358739).

2158887514221 is an equidigital number, since it uses as much as digits as its factorization.

2158887514221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79958796832 (or 79958796826 counting only the distinct ones).

The product of its digits is 2867200, while the sum is 54.

The spelling of 2158887514221 in words is "two trillion, one hundred fifty-eight billion, eight hundred eighty-seven million, five hundred fourteen thousand, two hundred twenty-one".