21002102204 has 12 divisors (see below), whose sum is σ = 37302241704. Its totient is φ = 10344318864.

The previous prime is 21002102201. The next prime is 21002102207. The reversal of 21002102204 is 40220120012.

It is an interprime number because it is at equal distance from previous prime (21002102201) and next prime (21002102207).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21002102201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39182759 + ... + 39183294.

It is an arithmetic number, because the mean of its divisors is an integer number (3108520142).

Almost surely, 2^21002102204 is an apocalyptic number.

It is an amenable number.

21002102204 is a deficient number, since it is larger than the sum of its proper divisors (16300139500).

21002102204 is a wasteful number, since it uses less digits than its factorization.

21002102204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78366124 (or 78366122 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 21002102204 its reverse (40220120012), we get a palindrome (61222222216).

The spelling of 21002102204 in words is "twenty-one billion, two million, one hundred two thousand, two hundred four".