115420221 has 20 divisors (see below), whose sum is σ = 197049952. Its totient is φ = 65954088.

The previous prime is 115420219. The next prime is 115420229. The reversal of 115420221 is 122024511.

It is not a de Polignac number, because 115420221 - 2¹ = 115420219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 115420194 and 115420203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (115420229) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 101215 + ... + 102348.

Almost surely, 2^115420221 is an apocalyptic number.

It is an amenable number.

115420221 is a deficient number, since it is larger than the sum of its proper divisors (81629731).

115420221 is an equidigital number, since it uses as much as digits as its factorization.

115420221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203582 (or 203573 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 115420221 is about 10743.3803339545. The cubic root of 115420221 is about 486.8860152035.

Adding to 115420221 its reverse (122024511), we get a palindrome (237444732).

The spelling of 115420221 in words is "one hundred fifteen million, four hundred twenty thousand, two hundred twenty-one".