221400344 has 32 divisors (see below), whose sum is σ = 458611200. Its totient is φ = 99359520.

The previous prime is 221400329. The next prime is 221400353. The reversal of 221400344 is 443004122.

It is a super-2 number, since 2×221400344² = 98036224646636672, which contains 22 as substring.

It is a congruent number.

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, 8972 + ... + 22875.

It is an arithmetic number, because the mean of its divisors is an integer number (14331600).

Almost surely, 2^221400344 is an apocalyptic number.

It is an amenable number.

221400344 is an abundant number, since it is smaller than the sum of its proper divisors (237210856).

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

221400344 is a wasteful number, since it uses less digits than its factorization.

221400344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31943 (or 31939 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 221400344 is about 14879.5276806759. The cubic root of 221400344 is about 604.9592158833.

Adding to 221400344 its reverse (443004122), we get a palindrome (664404466).

The spelling of 221400344 in words is "two hundred twenty-one million, four hundred thousand, three hundred forty-four".