21430200040 has 16 divisors (see below), whose sum is σ = 48217950180. Its totient is φ = 8572080000.

The previous prime is 21430200037. The next prime is 21430200047. The reversal of 21430200040 is 4000203412.

It can be written as a sum of positive squares in 2 ways, for example, as 18680875684 + 2749324356 = 136678^2 + 52434^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21430199987 and 21430200023.

It is not an unprimeable number, because it can be changed into a prime (21430200047) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 267877461 + ... + 267877540.

Almost surely, 2^21430200040 is an apocalyptic number.

21430200040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21430200040 is an abundant number, since it is smaller than the sum of its proper divisors (26787750140).

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

21430200040 is a wasteful number, since it uses less digits than its factorization.

21430200040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 535755012 (or 535755008 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

Adding to 21430200040 its reverse (4000203412), we get a palindrome (25430403452).

The spelling of 21430200040 in words is "twenty-one billion, four hundred thirty million, two hundred thousand, forty".