221497074 has 24 divisors (see below), whose sum is σ = 481927680. Its totient is φ = 73522008.

The previous prime is 221497069. The next prime is 221497103. The reversal of 221497074 is 470794122.

221497074 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×221497074² = 98121907581122952, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21442 + ... + 30045.

It is an arithmetic number, because the mean of its divisors is an integer number (20080320).

Almost surely, 2^221497074 is an apocalyptic number.

221497074 is an abundant number, since it is smaller than the sum of its proper divisors (260430606).

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

221497074 is a wasteful number, since it uses less digits than its factorization.

221497074 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51734 (or 51731 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 36.

The square root of 221497074 is about 14882.7777649201. Note that the first 4 decimals coincide. The cubic root of 221497074 is about 605.0473054557.

The spelling of 221497074 in words is "two hundred twenty-one million, four hundred ninety-seven thousand, seventy-four".