221115890151 has 72 divisors (see below), whose sum is σ = 372604009680. Its totient is φ = 128812083840.

The previous prime is 221115890117. The next prime is 221115890153. The reversal of 221115890151 is 151098511122.

It is a happy number.

221115890151 is a `hidden beast` number, since 2 + 21 + 1 + 1 + 589 + 0 + 1 + 51 = 666.

It is not a de Polignac number, because 221115890151 - 2⁶ = 221115890087 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221115890153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 167384571 + ... + 167385891.

It is an arithmetic number, because the mean of its divisors is an integer number (5175055690).

Almost surely, 2^221115890151 is an apocalyptic number.

221115890151 is a deficient number, since it is larger than the sum of its proper divisors (151488119529).

221115890151 is an equidigital number, since it uses as much as digits as its factorization.

221115890151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2702 (or 1356 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 36.

The spelling of 221115890151 in words is "two hundred twenty-one billion, one hundred fifteen million, eight hundred ninety thousand, one hundred fifty-one".