221253407 has 4 divisors (see below), whose sum is σ = 221291640. Its totient is φ = 221215176.

The previous prime is 221253401. The next prime is 221253413. The reversal of 221253407 is 704352122.

221253407 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (221253401) and next prime (221253413).

It is a cyclic number.

It is not a de Polignac number, because 221253407 - 2⁴ = 221253391 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221253401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8453 + ... + 22670.

It is an arithmetic number, because the mean of its divisors is an integer number (55322910).

Almost surely, 2^221253407 is an apocalyptic number.

221253407 is a deficient number, since it is larger than the sum of its proper divisors (38233).

221253407 is an equidigital number, since it uses as much as digits as its factorization.

221253407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38232.

The product of its (nonzero) digits is 3360, while the sum is 26.

The square root of 221253407 is about 14874.5893052548. The cubic root of 221253407 is about 604.8253549586.

The spelling of 221253407 in words is "two hundred twenty-one million, two hundred fifty-three thousand, four hundred seven".