221400350 has 48 divisors (see below), whose sum is σ = 459010800. Its totient is φ = 78958080.

The previous prime is 221400329. The next prime is 221400353. The reversal of 221400350 is 53004122.

221400350 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×221400350² = 98036229960245000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221400353) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9296 + ... + 23004.

It is an arithmetic number, because the mean of its divisors is an integer number (9562725).

Almost surely, 2^221400350 is an apocalyptic number.

221400350 is an abundant number, since it is smaller than the sum of its proper divisors (237610450).

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

221400350 is a wasteful number, since it uses less digits than its factorization.

221400350 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13757 (or 13752 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 221400350 is about 14879.5278822952. The cubic root of 221400350 is about 604.9592213482.

Adding to 221400350 its reverse (53004122), we get a palindrome (274404472).

The spelling of 221400350 in words is "two hundred twenty-one million, four hundred thousand, three hundred fifty".