21288702 has 16 divisors (see below), whose sum is σ = 44818560. Its totient is φ = 6722712.

The previous prime is 21288691. The next prime is 21288703. The reversal of 21288702 is 20788212.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21288702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21288703) 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, 93258 + ... + 93485.

It is an arithmetic number, because the mean of its divisors is an integer number (2801160).

Almost surely, 2^21288702 is an apocalyptic number.

21288702 is an abundant number, since it is smaller than the sum of its proper divisors (23529858).

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

21288702 is a wasteful number, since it uses less digits than its factorization.

21288702 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186767.

The product of its (nonzero) digits is 3584, while the sum is 30.

The square root of 21288702 is about 4613.9681403321. The cubic root of 21288702 is about 277.1509644673.

The spelling of 21288702 in words is "twenty-one million, two hundred eighty-eight thousand, seven hundred two".