21849402 has 16 divisors (see below), whose sum is σ = 45599040. Its totient is φ = 6966432.

The previous prime is 21849361. The next prime is 21849413. The reversal of 21849402 is 20494812.

It is a self number, because there is not a number n which added to its sum of digits gives 21849402.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79027 + ... + 79302.

It is an arithmetic number, because the mean of its divisors is an integer number (2849940).

Almost surely, 2^21849402 is an apocalyptic number.

21849402 is an abundant number, since it is smaller than the sum of its proper divisors (23749638).

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

21849402 is a wasteful number, since it uses less digits than its factorization.

21849402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158357.

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 21849402 is about 4674.3343911192. The cubic root of 21849402 is about 279.5631026564.

The spelling of 21849402 in words is "twenty-one million, eight hundred forty-nine thousand, four hundred two".