242102091 has 64 divisors (see below), whose sum is σ = 417715200. Its totient is φ = 123621120.

The previous prime is 242102059. The next prime is 242102099. The reversal of 242102091 is 190201242.

It is not a de Polignac number, because 242102091 - 2⁵ = 242102059 is a prime.

It is a super-2 number, since 2×242102091² = 117226844933144562, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (242102099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 826141 + ... + 826433.

It is an arithmetic number, because the mean of its divisors is an integer number (6526800).

Almost surely, 2^242102091 is an apocalyptic number.

242102091 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

242102091 is a deficient number, since it is larger than the sum of its proper divisors (175613109).

242102091 is a wasteful number, since it uses less digits than its factorization.

242102091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 401 (or 387 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 242102091 is about 15559.6301691268. The cubic root of 242102091 is about 623.2555867522.

The spelling of 242102091 in words is "two hundred forty-two million, one hundred two thousand, ninety-one".