21980002 has 8 divisors (see below), whose sum is σ = 35967312. Its totient is φ = 9990900.

The previous prime is 21979957. The next prime is 21980003. The reversal of 21980002 is 20008912.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Harshad number since it is a multiple of its sum of digits (22), and also a Moran number because the ratio is a prime number: 999091 = 21980002 / (2 + 1 + 9 + 8 + 0 + 0 + 0 + 2).

It is not an unprimeable number, because it can be changed into a prime (21980003) 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 3 ways as a sum of consecutive naturals, for example, 499524 + ... + 499567.

It is an arithmetic number, because the mean of its divisors is an integer number (4495914).

Almost surely, 2^21980002 is an apocalyptic number.

21980002 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21980002 is a deficient number, since it is larger than the sum of its proper divisors (13987310).

21980002 is a wasteful number, since it uses less digits than its factorization.

21980002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 999104.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 21980002 is about 4688.2834811901. The cubic root of 21980002 is about 280.1190055356.

Adding to 21980002 its reverse (20008912), we get a palindrome (41988914).

The spelling of 21980002 in words is "twenty-one million, nine hundred eighty thousand, two".