221273898 has 8 divisors (see below), whose sum is σ = 442547808. Its totient is φ = 73757964.

The previous prime is 221273881. The next prime is 221273903. The reversal of 221273898 is 898372122.

It is a happy number.

221273898 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

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

221273898 is an admirable number.

It is a super-2 number, since 2×221273898² = 97924275872228808, which contains 22 as substring.

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, 18439486 + ... + 18439497.

It is an arithmetic number, because the mean of its divisors is an integer number (55318476).

Almost surely, 2^221273898 is an apocalyptic number.

221273898 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

221273898 is a wasteful number, since it uses less digits than its factorization.

221273898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36878988.

The product of its digits is 96768, while the sum is 42.

The square root of 221273898 is about 14875.2780814343. The cubic root of 221273898 is about 604.8440259988.

The spelling of 221273898 in words is "two hundred twenty-one million, two hundred seventy-three thousand, eight hundred ninety-eight".