21213300040 has 16 divisors (see below), whose sum is σ = 47729925180. Its totient is φ = 8485320000.

The previous prime is 21213300013. The next prime is 21213300079. The reversal of 21213300040 is 4000331212.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 20347881316 + 865418724 = 142646^2 + 29418^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21213299987 and 21213300023.

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, 265166211 + ... + 265166290.

Almost surely, 2^21213300040 is an apocalyptic number.

21213300040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21213300040 is an abundant number, since it is smaller than the sum of its proper divisors (26516625140).

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

21213300040 is a wasteful number, since it uses less digits than its factorization.

21213300040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 530332512 (or 530332508 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 21213300040 its reverse (4000331212), we get a palindrome (25213631252).

The spelling of 21213300040 in words is "twenty-one billion, two hundred thirteen million, three hundred thousand, forty".