20215254151 has 4 divisors (see below), whose sum is σ = 20303530600. Its totient is φ = 20126977704.

The previous prime is 20215254133. The next prime is 20215254161. The reversal of 20215254151 is 15145251202.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15145251202 = 2 ⋅7572625601.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20215254151 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 (20215254161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44137881 + ... + 44138338.

It is an arithmetic number, because the mean of its divisors is an integer number (5075882650).

Almost surely, 2^20215254151 is an apocalyptic number.

20215254151 is a deficient number, since it is larger than the sum of its proper divisors (88276449).

20215254151 is an equidigital number, since it uses as much as digits as its factorization.

20215254151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88276448.

The product of its (nonzero) digits is 4000, while the sum is 28.

The spelling of 20215254151 in words is "twenty billion, two hundred fifteen million, two hundred fifty-four thousand, one hundred fifty-one".