21982402 has 16 divisors (see below), whose sum is σ = 35687232. Its totient is φ = 10095120.

The previous prime is 21982393. The next prime is 21982409. The reversal of 21982402 is 20428912.

It is not an unprimeable number, because it can be changed into a prime (21982409) by changing a digit.

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, 3483 + ... + 7489.

It is an arithmetic number, because the mean of its divisors is an integer number (2230452).

Almost surely, 2^21982402 is an apocalyptic number.

21982402 is a deficient number, since it is larger than the sum of its proper divisors (13704830).

21982402 is a wasteful number, since it uses less digits than its factorization.

21982402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4233.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 21982402 is about 4688.5394314221. The cubic root of 21982402 is about 280.1292005778.

It can be divided in two parts, 219 and 82402, that added together give a triangular number (82621 = T₄₀₆).

The spelling of 21982402 in words is "twenty-one million, nine hundred eighty-two thousand, four hundred two".