21500404022200 has 48 divisors (see below), whose sum is σ = 51339478270680. Its totient is φ = 8367724805760.

The previous prime is 21500404022183. The next prime is 21500404022291. The reversal of 21500404022200 is 222040400512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1452722602 + ... + 1452737401.

Almost surely, 2^{21500404022200} is an apocalyptic number.

21500404022200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21500404022200 is an abundant number, since it is smaller than the sum of its proper divisors (29839074248480).

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

21500404022200 is a wasteful number, since it uses less digits than its factorization.

21500404022200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2905460056 (or 2905460047 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 22.

Adding to 21500404022200 its reverse (222040400512), we get a palindrome (21722444422712).

The spelling of 21500404022200 in words is "twenty-one trillion, five hundred billion, four hundred four million, twenty-two thousand, two hundred".