221898770537472 has 528 divisors, whose sum is σ = 778515066201600. Its totient is φ = 59498910941184.

The previous prime is 221898770537467. The next prime is 221898770537489. The reversal of 221898770537472 is 274735077898122.

221898770537472 is a `hidden beast` number, since 2 + 2 + 1 + 8 + 9 + 87 + 7 + 0 + 537 + 4 + 7 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a self number, because there is not a number n which added to its sum of digits gives 221898770537472.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 77229279 + ... + 80050977.

Almost surely, 2^{221898770537472} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221898770537472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (389257533100800).

221898770537472 is an abundant number, since it is smaller than the sum of its proper divisors (556616295664128).

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

221898770537472 is a wasteful number, since it uses less digits than its factorization.

221898770537472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2821808 (or 2821787 counting only the distinct ones).

The product of its (nonzero) digits is 663828480, while the sum is 72.

The spelling of 221898770537472 in words is "two hundred twenty-one trillion, eight hundred ninety-eight billion, seven hundred seventy million, five hundred thirty-seven thousand, four hundred seventy-two".