21394802 has 32 divisors (see below), whose sum is σ = 37981440. Its totient is φ = 8910720.

The previous prime is 21394781. The next prime is 21394819. The reversal of 21394802 is 20849312.

It is a Smith number, since the sum of its digits (29) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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 15 ways as a sum of consecutive naturals, for example, 68198 + ... + 68510.

It is an arithmetic number, because the mean of its divisors is an integer number (1186920).

Almost surely, 2^21394802 is an apocalyptic number.

21394802 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21394802 is a deficient number, since it is larger than the sum of its proper divisors (16586638).

21394802 is a wasteful number, since it uses less digits than its factorization.

21394802 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 578.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 21394802 is about 4625.4515455250. The cubic root of 21394802 is about 277.6106292663.

Subtracting from 21394802 its reverse (20849312), we obtain a triangular number (545490 = T₁₀₄₄).

The spelling of 21394802 in words is "twenty-one million, three hundred ninety-four thousand, eight hundred two".