21320312450 has 12 divisors (see below), whose sum is σ = 39655781250. Its totient is φ = 8528124960.

The previous prime is 21320312441. The next prime is 21320312479. The reversal of 21320312450 is 5421302312.

It can be written as a sum of positive squares in 3 ways, for example, as 16742030881 + 4578281569 = 129391^2 + 67663^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 213203075 + ... + 213203174.

Almost surely, 2^21320312450 is an apocalyptic number.

21320312450 is a deficient number, since it is larger than the sum of its proper divisors (18335468800).

21320312450 is a wasteful number, since it uses less digits than its factorization.

21320312450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 426406261 (or 426406256 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 23.

Adding to 21320312450 its reverse (5421302312), we get a palindrome (26741614762).

The spelling of 21320312450 in words is "twenty-one billion, three hundred twenty million, three hundred twelve thousand, four hundred fifty".