21842910 has 48 divisors (see below), whose sum is σ = 58631040. Its totient is φ = 5636160.

The previous prime is 21842903. The next prime is 21842917. The reversal of 21842910 is 1924812.

It is an interprime number because it is at equal distance from previous prime (21842903) and next prime (21842917).

It is a super-2 number, since 2×21842910² = 954225434536200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21842917) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1125 + ... + 6704.

It is an arithmetic number, because the mean of its divisors is an integer number (1221480).

Almost surely, 2^21842910 is an apocalyptic number.

21842910 is an abundant number, since it is smaller than the sum of its proper divisors (36788130).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21842910 is a wasteful number, since it uses less digits than its factorization.

21842910 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7873 (or 7870 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 21842910 is about 4673.6399091072. The cubic root of 21842910 is about 279.5354115333.

The spelling of 21842910 in words is "twenty-one million, eight hundred forty-two thousand, nine hundred ten".