21115225000 has 48 divisors (see below), whose sum is σ = 49485699900. Its totient is φ = 8446080000.

The previous prime is 21115224997. The next prime is 21115225031. The reversal of 21115225000 is 52251112.

It can be written as a sum of positive squares in 6 ways, for example, as 687383524 + 20427841476 = 26218^2 + 142926^2 .

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, 397305 + ... + 447304.

Almost surely, 2^21115225000 is an apocalyptic number.

21115225000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21115225000 is an abundant number, since it is smaller than the sum of its proper divisors (28370474900).

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

21115225000 is an frugal number, since it uses more digits than its factorization.

21115225000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 844640 (or 844616 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 19.

Adding to 21115225000 its reverse (52251112), we get a palindrome (21167476112).

The spelling of 21115225000 in words is "twenty-one billion, one hundred fifteen million, two hundred twenty-five thousand".