151981530021 has 6 divisors (see below), whose sum is σ = 219528876710. Its totient is φ = 101321020008.

The previous prime is 151981529963. The next prime is 151981530023. The reversal of 151981530021 is 120035189151.

151981530021 is a `hidden beast` number, since 15 + 1 + 98 + 1 + 530 + 0 + 21 = 666.

151981530021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 104707899396 + 47273630625 = 323586^2 + 217425^2 .

It is not a de Polignac number, because 151981530021 - 2⁷ = 151981529893 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 (151981530023) 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 5 ways as a sum of consecutive naturals, for example, 8443418326 + ... + 8443418343.

Almost surely, 2^151981530021 is an apocalyptic number.

It is an amenable number.

151981530021 is a deficient number, since it is larger than the sum of its proper divisors (67547346689).

151981530021 is a wasteful number, since it uses less digits than its factorization.

151981530021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16886836675 (or 16886836672 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 36.

The spelling of 151981530021 in words is "one hundred fifty-one billion, nine hundred eighty-one million, five hundred thirty thousand, twenty-one".