21302274 has 16 divisors (see below), whose sum is σ = 48691008. Its totient is φ = 6086352.

The previous prime is 21302273. The next prime is 21302279. The reversal of 21302274 is 47220312.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21302274.

It is not an unprimeable number, because it can be changed into a prime (21302273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 253557 + ... + 253640.

It is an arithmetic number, because the mean of its divisors is an integer number (3043188).

Almost surely, 2^21302274 is an apocalyptic number.

21302274 is an abundant number, since it is smaller than the sum of its proper divisors (27388734).

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

21302274 is a wasteful number, since it uses less digits than its factorization.

21302274 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 507209.

The product of its (nonzero) digits is 672, while the sum is 21.

The square root of 21302274 is about 4615.4386573759. The cubic root of 21302274 is about 277.2098484993.

Adding to 21302274 its reverse (47220312), we get a palindrome (68522586).

The spelling of 21302274 in words is "twenty-one million, three hundred two thousand, two hundred seventy-four".