221535321652156 has 6 divisors (see below), whose sum is σ = 387686812891280. Its totient is φ = 110767660826076.

The previous prime is 221535321652111. The next prime is 221535321652163. The reversal of 221535321652156 is 651256123535122.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27691915206516 + ... + 27691915206523.

Almost surely, 2^{221535321652156} is an apocalyptic number.

It is an amenable number.

221535321652156 is a deficient number, since it is larger than the sum of its proper divisors (166151491239124).

221535321652156 is a wasteful number, since it uses less digits than its factorization.

221535321652156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55383830413043 (or 55383830413041 counting only the distinct ones).

The product of its digits is 3240000, while the sum is 49.

The spelling of 221535321652156 in words is "two hundred twenty-one trillion, five hundred thirty-five billion, three hundred twenty-one million, six hundred fifty-two thousand, one hundred fifty-six".