21323100040 has 32 divisors (see below), whose sum is σ = 52338519360. Its totient is φ = 7753854400.

The previous prime is 21323100031. The next prime is 21323100089. The reversal of 21323100040 is 4000132312.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21323099987 and 21323100023.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24230356 + ... + 24231235.

It is an arithmetic number, because the mean of its divisors is an integer number (1635578730).

Almost surely, 2^21323100040 is an apocalyptic number.

21323100040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21323100040 is an abundant number, since it is smaller than the sum of its proper divisors (31015419320).

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

21323100040 is a wasteful number, since it uses less digits than its factorization.

21323100040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48461613 (or 48461609 counting only the distinct ones).

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

Adding to 21323100040 its reverse (4000132312), we get a palindrome (25323232352).

The spelling of 21323100040 in words is "twenty-one billion, three hundred twenty-three million, one hundred thousand, forty".