221656672120 has 64 divisors (see below), whose sum is σ = 540195959520. Its totient is φ = 81369352704.

The previous prime is 221656672067. The next prime is 221656672121. The reversal of 221656672120 is 21276656122.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221656672121) 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, 1142014 + ... + 1321933.

Almost surely, 2^221656672120 is an apocalyptic number.

221656672120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221656672120 is an abundant number, since it is smaller than the sum of its proper divisors (318539287400).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221656672120 is a wasteful number, since it uses less digits than its factorization.

221656672120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2464144 (or 2464140 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 40.

The spelling of 221656672120 in words is "two hundred twenty-one billion, six hundred fifty-six million, six hundred seventy-two thousand, one hundred twenty".