156068021 has 2 divisors, whose sum is σ = 156068022. Its totient is φ = 156068020.

The previous prime is 156068009. The next prime is 156068023. The reversal of 156068021 is 120860651.

It is a happy number.

156068021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 123520996 + 32547025 = 11114^2 + 5705^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-156068021 is a prime.

It is a Sophie Germain prime.

Together with 156068023, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (156068023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78034010 + 78034011.

It is an arithmetic number, because the mean of its divisors is an integer number (78034011).

Almost surely, 2^156068021 is an apocalyptic number.

It is an amenable number.

156068021 is a deficient number, since it is larger than the sum of its proper divisors (1).

156068021 is an equidigital number, since it uses as much as digits as its factorization.

156068021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 156068021 is about 12492.7187193181. The cubic root of 156068021 is about 538.3994916141.

The spelling of 156068021 in words is "one hundred fifty-six million, sixty-eight thousand, twenty-one".