21213340004 has 12 divisors (see below), whose sum is σ = 37124420844. Its totient is φ = 10606362624.

The previous prime is 21213339997. The next prime is 21213340051. The reversal of 21213340004 is 40004331212.

It can be written as a sum of positive squares in 2 ways, for example, as 19960038400 + 1253301604 = 141280^2 + 35402^2 .

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, 158564 + ... + 259940.

It is an arithmetic number, because the mean of its divisors is an integer number (3093701737).

Almost surely, 2^21213340004 is an apocalyptic number.

It is an amenable number.

21213340004 is a deficient number, since it is larger than the sum of its proper divisors (15911080840).

21213340004 is a wasteful number, since it uses less digits than its factorization.

21213340004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153694 (or 153692 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 21213340004 its reverse (40004331212), we get a palindrome (61217671216).

The spelling of 21213340004 in words is "twenty-one billion, two hundred thirteen million, three hundred forty thousand, four".