21004402242 has 16 divisors (see below), whose sum is σ = 42394207680. Its totient is φ = 6937233552.

The previous prime is 21004402231. The next prime is 21004402261. The reversal of 21004402242 is 24220440012.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16057758 + ... + 16059065.

It is an arithmetic number, because the mean of its divisors is an integer number (2649637980).

Almost surely, 2^21004402242 is an apocalyptic number.

21004402242 is an abundant number, since it is smaller than the sum of its proper divisors (21389805438).

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

21004402242 is a wasteful number, since it uses less digits than its factorization.

21004402242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32116937.

The product of its (nonzero) digits is 1024, while the sum is 21.

Adding to 21004402242 its reverse (24220440012), we get a palindrome (45224842254).

The spelling of 21004402242 in words is "twenty-one billion, four million, four hundred two thousand, two hundred forty-two".