156045021 has 32 divisors (see below), whose sum is σ = 234551808. Its totient is φ = 91448640.

The previous prime is 156045013. The next prime is 156045031. The reversal of 156045021 is 120540651.

It is not a de Polignac number, because 156045021 - 2³ = 156045013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 156044982 and 156045000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (156045031) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 276886 + ... + 277448.

It is an arithmetic number, because the mean of its divisors is an integer number (7329744).

Almost surely, 2^156045021 is an apocalyptic number.

156045021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

156045021 is a deficient number, since it is larger than the sum of its proper divisors (78506787).

156045021 is a wasteful number, since it uses less digits than its factorization.

156045021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 841.

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 156045021 is about 12491.7981491857. The cubic root of 156045021 is about 538.3730420430.

Adding to 156045021 its reverse (120540651), we get a palindrome (276585672).

The spelling of 156045021 in words is "one hundred fifty-six million, forty-five thousand, twenty-one".