221407455 has 16 divisors (see below), whose sum is σ = 355069440. Its totient is φ = 117811488.

The previous prime is 221407441. The next prime is 221407457. The reversal of 221407455 is 554704122.

It is not a de Polignac number, because 221407455 - 2¹¹ = 221405407 is a prime.

It is a super-2 number, since 2×221407455² = 98042522259154050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221407457) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10227 + ... + 23396.

It is an arithmetic number, because the mean of its divisors is an integer number (22191840).

Almost surely, 2^221407455 is an apocalyptic number.

221407455 is a deficient number, since it is larger than the sum of its proper divisors (133661985).

221407455 is a wasteful number, since it uses less digits than its factorization.

221407455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34070.

The product of its (nonzero) digits is 11200, while the sum is 30.

The square root of 221407455 is about 14879.7666312345. The cubic root of 221407455 is about 604.9656925654.

The spelling of 221407455 in words is "two hundred twenty-one million, four hundred seven thousand, four hundred fifty-five".