221957412 has 24 divisors (see below), whose sum is σ = 518497056. Its totient is φ = 73900608.

The previous prime is 221957381. The next prime is 221957459. The reversal of 221957412 is 214759122.

221957412 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 688 + ... + 21080.

It is an arithmetic number, because the mean of its divisors is an integer number (21604044).

Almost surely, 2^221957412 is an apocalyptic number.

It is an amenable number.

221957412 is an abundant number, since it is smaller than the sum of its proper divisors (296539644).

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

221957412 is a wasteful number, since it uses less digits than its factorization.

221957412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21307 (or 21305 counting only the distinct ones).

The product of its digits is 10080, while the sum is 33.

The square root of 221957412 is about 14898.2351974991. The cubic root of 221957412 is about 605.4661725916.

The spelling of 221957412 in words is "two hundred twenty-one million, nine hundred fifty-seven thousand, four hundred twelve".