2154211157 has 32 divisors (see below), whose sum is σ = 2574240000. Its totient is φ = 1801396800.

The previous prime is 2154211109. The next prime is 2154211177. The reversal of 2154211157 is 7511124512.

It is not a de Polignac number, because 2154211157 - 2¹⁰ = 2154210133 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 (2154211177) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3117182 + ... + 3117872.

It is an arithmetic number, because the mean of its divisors is an integer number (80445000).

Almost surely, 2^2154211157 is an apocalyptic number.

It is an amenable number.

2154211157 is a deficient number, since it is larger than the sum of its proper divisors (420028843).

2154211157 is an equidigital number, since it uses as much as digits as its factorization.

2154211157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 922 (or 908 counting only the distinct ones).

The product of its digits is 2800, while the sum is 29.

The square root of 2154211157 is about 46413.4803370745. The cubic root of 2154211157 is about 1291.5049952926.

Adding to 2154211157 its reverse (7511124512), we get a palindrome (9665335669).

The spelling of 2154211157 in words is "two billion, one hundred fifty-four million, two hundred eleven thousand, one hundred fifty-seven".