221173972980 has 192 divisors, whose sum is σ = 668512051200. Its totient is φ = 54467804160.

The previous prime is 221173972969. The next prime is 221173972997. The reversal of 221173972980 is 89279371122.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 7188309 + ... + 7219011.

It is an arithmetic number, because the mean of its divisors is an integer number (3481833600).

Almost surely, 2^221173972980 is an apocalyptic number.

221173972980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221173972980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (334256025600).

221173972980 is an abundant number, since it is smaller than the sum of its proper divisors (447338078220).

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

221173972980 is a wasteful number, since it uses less digits than its factorization.

221173972980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30894 (or 30892 counting only the distinct ones).

The product of its (nonzero) digits is 762048, while the sum is 51.

The spelling of 221173972980 in words is "two hundred twenty-one billion, one hundred seventy-three million, nine hundred seventy-two thousand, nine hundred eighty".