156071641221 has 12 divisors (see below), whose sum is σ = 225522860940. Its totient is φ = 104008047360.

The previous prime is 156071641207. The next prime is 156071641261. The reversal of 156071641221 is 122146170651.

156071641221 is a `hidden beast` number, since 1 + 5 + 6 + 0 + 7 + 1 + 641 + 2 + 2 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 111228920100 + 44842721121 = 333510^2 + 211761^2 .

It is not a de Polignac number, because 156071641221 - 2¹⁷ = 156071510149 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (156071641261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3284556 + ... + 3331733.

It is an arithmetic number, because the mean of its divisors is an integer number (18793571745).

Almost surely, 2^156071641221 is an apocalyptic number.

It is an amenable number.

156071641221 is a deficient number, since it is larger than the sum of its proper divisors (69451219719).

156071641221 is a wasteful number, since it uses less digits than its factorization.

156071641221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6618916 (or 6618913 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The spelling of 156071641221 in words is "one hundred fifty-six billion, seventy-one million, six hundred forty-one thousand, two hundred twenty-one".