20215342251 has 24 divisors (see below), whose sum is σ = 31494808800. Its totient is φ = 12420936576.

The previous prime is 20215342177. The next prime is 20215342261. The reversal of 20215342251 is 15224351202.

20215342251 is a `hidden beast` number, since 20 + 215 + 3 + 422 + 5 + 1 = 666.

It is not a de Polignac number, because 20215342251 - 2⁷ = 20215342123 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20215342261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 57826 + ... + 209223.

It is an arithmetic number, because the mean of its divisors is an integer number (1312283700).

Almost surely, 2^20215342251 is an apocalyptic number.

20215342251 is a deficient number, since it is larger than the sum of its proper divisors (11279466549).

20215342251 is a wasteful number, since it uses less digits than its factorization.

20215342251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 267715 (or 267712 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

Adding to 20215342251 its reverse (15224351202), we get a palindrome (35439693453).

The spelling of 20215342251 in words is "twenty billion, two hundred fifteen million, three hundred forty-two thousand, two hundred fifty-one".