156010021 has 4 divisors (see below), whose sum is σ = 156116844. Its totient is φ = 155903200.

The previous prime is 156009941. The next prime is 156010031. The reversal of 156010021 is 120010651.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120010651 = 3889 ⋅30859.

It can be written as a sum of positive squares in 2 ways, for example, as 19236996 + 136773025 = 4386^2 + 11695^2 .

It is a cyclic number.

It is not a de Polignac number, because 156010021 - 2¹³ = 156001829 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 156009977 and 156010004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (156010031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51190 + ... + 54151.

It is an arithmetic number, because the mean of its divisors is an integer number (39029211).

Almost surely, 2^156010021 is an apocalyptic number.

It is an amenable number.

156010021 is a deficient number, since it is larger than the sum of its proper divisors (106823).

156010021 is a wasteful number, since it uses less digits than its factorization.

156010021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106822.

The product of its (nonzero) digits is 60, while the sum is 16.

The square root of 156010021 is about 12490.3971514120. The cubic root of 156010021 is about 538.3327877084.

Adding to 156010021 its reverse (120010651), we get a palindrome (276020672).

The spelling of 156010021 in words is "one hundred fifty-six million, ten thousand, twenty-one".