221022251451 has 10 divisors (see below), whose sum is σ = 330169042412. Its totient is φ = 147348167580.

The previous prime is 221022251413. The next prime is 221022251459. The reversal of 221022251451 is 154152220122.

221022251451 is a `hidden beast` number, since 22 + 102 + 22 + 514 + 5 + 1 = 666.

It is not a de Polignac number, because 221022251451 - 2¹⁴ = 221022235067 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221022251459) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1364334805 + ... + 1364334966.

Almost surely, 2^221022251451 is an apocalyptic number.

221022251451 is a deficient number, since it is larger than the sum of its proper divisors (109146790961).

221022251451 is an equidigital number, since it uses as much as digits as its factorization.

221022251451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2728669783 (or 2728669774 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 27.

Adding to 221022251451 its reverse (154152220122), we get a palindrome (375174471573).

The spelling of 221022251451 in words is "two hundred twenty-one billion, twenty-two million, two hundred fifty-one thousand, four hundred fifty-one".