156723004221 has 16 divisors (see below), whose sum is σ = 238874484864. Its totient is φ = 89534073024.

The previous prime is 156723004133. The next prime is 156723004279. The reversal of 156723004221 is 122400327651.

It is not a de Polignac number, because 156723004221 - 2¹⁰ = 156723003197 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (156723004621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 825726 + ... + 997631.

It is an arithmetic number, because the mean of its divisors is an integer number (14929655304).

Almost surely, 2^156723004221 is an apocalyptic number.

It is an amenable number.

156723004221 is a deficient number, since it is larger than the sum of its proper divisors (82151480643).

156723004221 is a wasteful number, since it uses less digits than its factorization.

156723004221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1827460.

The product of its (nonzero) digits is 20160, while the sum is 33.

The spelling of 156723004221 in words is "one hundred fifty-six billion, seven hundred twenty-three million, four thousand, two hundred twenty-one".