21210000032 has 24 divisors (see below), whose sum is σ = 44969279796. Its totient is φ = 9789230592.

The previous prime is 21210000013. The next prime is 21210000043. The reversal of 21210000032 is 23000001212.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 21174906256 + 35093776 = 145516^2 + 5924^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21209999968 and 21210000022.

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, 25492373 + ... + 25493204.

Almost surely, 2^21210000032 is an apocalyptic number.

It is an amenable number.

21210000032 is an abundant number, since it is smaller than the sum of its proper divisors (23759279764).

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

21210000032 is a wasteful number, since it uses less digits than its factorization.

21210000032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50985600 (or 50985592 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 11.

Adding to 21210000032 its reverse (23000001212), we get a palindrome (44210001244).

The spelling of 21210000032 in words is "twenty-one billion, two hundred ten million, thirty-two", and thus it is an aban number.