21030402204 has 144 divisors (see below), whose sum is σ = 61491096576. Its totient is φ = 5936112000.

The previous prime is 21030402193. The next prime is 21030402229. The reversal of 21030402204 is 40220403012.

21030402204 is a `hidden beast` number, since 210 + 30 + 402 + 20 + 4 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 23084509 + ... + 23085419.

It is an arithmetic number, because the mean of its divisors is an integer number (427021504).

Almost surely, 2^21030402204 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21030402204, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30745548288).

21030402204 is an abundant number, since it is smaller than the sum of its proper divisors (40460694372).

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

21030402204 is a wasteful number, since it uses less digits than its factorization.

21030402204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1936 (or 1931 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

Adding to 21030402204 its reverse (40220403012), we get a palindrome (61250805216).

The spelling of 21030402204 in words is "twenty-one billion, thirty million, four hundred two thousand, two hundred four".