221321854692 has 144 divisors (see below), whose sum is σ = 600012241920. Its totient is φ = 68584320000.

The previous prime is 221321854687. The next prime is 221321854709. The reversal of 221321854692 is 296458123122.

221321854692 is a `hidden beast` number, since 2 + 2 + 1 + 3 + 2 + 18 + 546 + 92 = 666.

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, 7792317 + ... + 7820667.

It is an arithmetic number, because the mean of its divisors is an integer number (4166751680).

Almost surely, 2^221321854692 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 221321854692, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (300006120960).

221321854692 is an abundant number, since it is smaller than the sum of its proper divisors (378690387228).

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

221321854692 is a wasteful number, since it uses less digits than its factorization.

221321854692 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28594 (or 28589 counting only the distinct ones).

The product of its digits is 414720, while the sum is 45.

The spelling of 221321854692 in words is "two hundred twenty-one billion, three hundred twenty-one million, eight hundred fifty-four thousand, six hundred ninety-two".