221454131 has 2 divisors, whose sum is σ = 221454132. Its totient is φ = 221454130.

The previous prime is 221454127. The next prime is 221454137. The reversal of 221454131 is 131454122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221454131 - 2² = 221454127 is a prime.

It is a super-4 number, since 4×221454131⁴ (a number of 34 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 221454097 and 221454106.

It is not a weakly prime, because it can be changed into another prime (221454137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110727065 + 110727066.

It is an arithmetic number, because the mean of its divisors is an integer number (110727066).

Almost surely, 2^221454131 is an apocalyptic number.

221454131 is a deficient number, since it is larger than the sum of its proper divisors (1).

221454131 is an equidigital number, since it uses as much as digits as its factorization.

221454131 is an evil number, because the sum of its binary digits is even.

The product of its digits is 960, while the sum is 23.

The square root of 221454131 is about 14881.3349871576. The cubic root of 221454131 is about 605.0082015144.

Subtracting from 221454131 its reverse (131454122), we obtain a palindrome (90000009).

The spelling of 221454131 in words is "two hundred twenty-one million, four hundred fifty-four thousand, one hundred thirty-one".