221656424330151 has 16 divisors (see below), whose sum is σ = 328392635109120. Its totient is φ = 147765213307800.

The previous prime is 221656424330149. The next prime is 221656424330161. The reversal of 221656424330151 is 151033424656122.

221656424330151 is a `hidden beast` number, since 2 + 2 + 1 + 6 + 5 + 64 + 2 + 433 + 0 + 151 = 666.

It is not a de Polignac number, because 221656424330151 - 2¹ = 221656424330149 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221656424330097 and 221656424330106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221656424330161) 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, 158631675 + ... + 160022876.

It is an arithmetic number, because the mean of its divisors is an integer number (20524539694320).

Almost surely, 2^{221656424330151} is an apocalyptic number.

221656424330151 is a deficient number, since it is larger than the sum of its proper divisors (106736210778969).

221656424330151 is a wasteful number, since it uses less digits than its factorization.

221656424330151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 318680323 (or 318680317 counting only the distinct ones).

The product of its (nonzero) digits is 1036800, while the sum is 45.

Adding to 221656424330151 its reverse (151033424656122), we get a palindrome (372689848986273).

The spelling of 221656424330151 in words is "two hundred twenty-one trillion, six hundred fifty-six billion, four hundred twenty-four million, three hundred thirty thousand, one hundred fifty-one".