221043374581 has 8 divisors (see below), whose sum is σ = 226240421760. Its totient is φ = 215866910688.

The previous prime is 221043374557. The next prime is 221043374603. The reversal of 221043374581 is 185473340122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221043374581 - 2⁵ = 221043374549 is a prime.

It is a super-2 number, since 2×221043374581² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221043374551) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5124091 + ... + 5167048.

It is an arithmetic number, because the mean of its divisors is an integer number (28280052720).

Almost surely, 2^221043374581 is an apocalyptic number.

It is an amenable number.

221043374581 is a deficient number, since it is larger than the sum of its proper divisors (5197047179).

221043374581 is a wasteful number, since it uses less digits than its factorization.

221043374581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10291643.

The product of its (nonzero) digits is 161280, while the sum is 40.

The spelling of 221043374581 in words is "two hundred twenty-one billion, forty-three million, three hundred seventy-four thousand, five hundred eighty-one".