21310442404 has 12 divisors (see below), whose sum is σ = 37508843484. Its totient is φ = 10593629984.

The previous prime is 21310442383. The next prime is 21310442441. The reversal of 21310442404 is 40424401312.

It can be written as a sum of positive squares in 2 ways, for example, as 15974432100 + 5336010304 = 126390^2 + 73048^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15397027 + ... + 15398410.

It is an arithmetic number, because the mean of its divisors is an integer number (3125736957).

Almost surely, 2^21310442404 is an apocalyptic number.

It is an amenable number.

21310442404 is a deficient number, since it is larger than the sum of its proper divisors (16198401080).

21310442404 is a wasteful number, since it uses less digits than its factorization.

21310442404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30795614 (or 30795612 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 25.

Adding to 21310442404 its reverse (40424401312), we get a palindrome (61734843716).

The spelling of 21310442404 in words is "twenty-one billion, three hundred ten million, four hundred forty-two thousand, four hundred four".