21814770 has 16 divisors (see below), whose sum is σ = 52355520. Its totient is φ = 5817264.

The previous prime is 21814739. The next prime is 21814777. The reversal of 21814770 is 7741812.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 727159 = 21814770 / (2 + 1 + 8 + 1 + 4 + 7 + 7 + 0).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21814777) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 363550 + ... + 363609.

It is an arithmetic number, because the mean of its divisors is an integer number (3272220).

Almost surely, 2^21814770 is an apocalyptic number.

21814770 is an abundant number, since it is smaller than the sum of its proper divisors (30540750).

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

21814770 is a wasteful number, since it uses less digits than its factorization.

21814770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 727169.

The product of its (nonzero) digits is 3136, while the sum is 30.

The square root of 21814770 is about 4670.6284373733. The cubic root of 21814770 is about 279.4153190662.

The spelling of 21814770 in words is "twenty-one million, eight hundred fourteen thousand, seven hundred seventy".