21230040100 has 18 divisors (see below), whose sum is σ = 46069187234. Its totient is φ = 8492016000.

The previous prime is 21230040049. The next prime is 21230040103. The reversal of 21230040100 is 104003212.

It can be written as a sum of positive squares in 3 ways, for example, as 1905147904 + 19324892196 = 43648^2 + 139014^2 .

It is not an unprimeable number, because it can be changed into a prime (21230040103) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 106150101 + ... + 106150300.

Almost surely, 2^21230040100 is an apocalyptic number.

21230040100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21230040100 is an abundant number, since it is smaller than the sum of its proper divisors (24839147134).

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

21230040100 is a wasteful number, since it uses less digits than its factorization.

21230040100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212300415 (or 212300408 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 13.

Adding to 21230040100 its reverse (104003212), we get a palindrome (21334043312).

The spelling of 21230040100 in words is "twenty-one billion, two hundred thirty million, forty thousand, one hundred".