21203242004 has 96 divisors (see below), whose sum is σ = 45358790400. Its totient is φ = 8479779840.

The previous prime is 21203241973. The next prime is 21203242013. The reversal of 21203242004 is 40024230212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3625907 + ... + 3631749.

It is an arithmetic number, because the mean of its divisors is an integer number (472487400).

Almost surely, 2^21203242004 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 21203242004, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22679395200).

21203242004 is an abundant number, since it is smaller than the sum of its proper divisors (24155548396).

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

21203242004 is a wasteful number, since it uses less digits than its factorization.

21203242004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6033 (or 6031 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

Adding to 21203242004 its reverse (40024230212), we get a palindrome (61227472216).

The spelling of 21203242004 in words is "twenty-one billion, two hundred three million, two hundred forty-two thousand, four".