21031302204 has 72 divisors (see below), whose sum is σ = 58812324480. Its totient is φ = 6283351200.

The previous prime is 21031302181. The next prime is 21031302209. The reversal of 21031302204 is 40220313012.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21031302209) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 345894 + ... + 402125.

It is an arithmetic number, because the mean of its divisors is an integer number (816837840).

Almost surely, 2^21031302204 is an apocalyptic number.

It is an amenable number.

21031302204 is an abundant number, since it is smaller than the sum of its proper divisors (37781022276).

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

21031302204 is a wasteful number, since it uses less digits than its factorization.

21031302204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 748111 (or 748106 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 21031302204 its reverse (40220313012), we get a palindrome (61251615216).

The spelling of 21031302204 in words is "twenty-one billion, thirty-one million, three hundred two thousand, two hundred four".