221661131235254 has 48 divisors (see below), whose sum is σ = 356987451900768. Its totient is φ = 103194754403328.

The previous prime is 221661131235209. The next prime is 221661131235259. The reversal of 221661131235254 is 452532131166122.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221661131235259) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 57488162 + ... + 61222634.

It is an arithmetic number, because the mean of its divisors is an integer number (7437238581266).

Almost surely, 2^{221661131235254} is an apocalyptic number.

221661131235254 is a deficient number, since it is larger than the sum of its proper divisors (135326320665514).

221661131235254 is a wasteful number, since it uses less digits than its factorization.

221661131235254 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3735609 (or 3735592 counting only the distinct ones).

The product of its digits is 518400, while the sum is 44.

The spelling of 221661131235254 in words is "two hundred twenty-one trillion, six hundred sixty-one billion, one hundred thirty-one million, two hundred thirty-five thousand, two hundred fifty-four".