20121552451 has 32 divisors (see below), whose sum is σ = 27320025600. Its totient is φ = 14310362880.

The previous prime is 20121552443. The next prime is 20121552487. The reversal of 20121552451 is 15425512102.

It is not a de Polignac number, because 20121552451 - 2³ = 20121552443 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20121552401) 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 31 ways as a sum of consecutive naturals, for example, 23841 + ... + 202018.

It is an arithmetic number, because the mean of its divisors is an integer number (853750800).

Almost surely, 2^20121552451 is an apocalyptic number.

20121552451 is a deficient number, since it is larger than the sum of its proper divisors (7198473149).

20121552451 is a wasteful number, since it uses less digits than its factorization.

20121552451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225979.

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

The spelling of 20121552451 in words is "twenty billion, one hundred twenty-one million, five hundred fifty-two thousand, four hundred fifty-one".