221540498 has 8 divisors (see below), whose sum is σ = 351858492. Its totient is φ = 104254336.

The previous prime is 221540479. The next prime is 221540533. The reversal of 221540498 is 894045122.

It can be written as a sum of positive squares in 2 ways, for example, as 173001409 + 48539089 = 13153^2 + 6967^2 .

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

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3257915 + ... + 3257982.

Almost surely, 2^221540498 is an apocalyptic number.

221540498 is a deficient number, since it is larger than the sum of its proper divisors (130317994).

221540498 is a wasteful number, since it uses less digits than its factorization.

221540498 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6515916.

The product of its (nonzero) digits is 23040, while the sum is 35.

The square root of 221540498 is about 14884.2365608720. The cubic root of 221540498 is about 605.0868422570.

The spelling of 221540498 in words is "two hundred twenty-one million, five hundred forty thousand, four hundred ninety-eight".