221749724922 has 64 divisors (see below), whose sum is σ = 521943191424. Its totient is φ = 62050826240.

The previous prime is 221749724909. The next prime is 221749724971. The reversal of 221749724922 is 229427947122.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1805043 + ... + 1923974.

It is an arithmetic number, because the mean of its divisors is an integer number (8155362366).

Almost surely, 2^221749724922 is an apocalyptic number.

221749724922 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

221749724922 is an abundant number, since it is smaller than the sum of its proper divisors (300193466502).

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

221749724922 is a wasteful number, since it uses less digits than its factorization.

221749724922 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3729103.

The product of its digits is 2032128, while the sum is 51.

The spelling of 221749724922 in words is "two hundred twenty-one billion, seven hundred forty-nine million, seven hundred twenty-four thousand, nine hundred twenty-two".