21155232200 has 48 divisors (see below), whose sum is σ = 49195512000. Its totient is φ = 8460441920.

The previous prime is 21155232199. The next prime is 21155232211. The reversal of 21155232200 is 223255112.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1890221 + ... + 1901379.

It is an arithmetic number, because the mean of its divisors is an integer number (1024906500).

Almost surely, 2^21155232200 is an apocalyptic number.

21155232200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21155232200 is an abundant number, since it is smaller than the sum of its proper divisors (28040279800).

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

21155232200 is a wasteful number, since it uses less digits than its factorization.

21155232200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20654 (or 20645 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 23.

Adding to 21155232200 its reverse (223255112), we get a palindrome (21378487312).

The spelling of 21155232200 in words is "twenty-one billion, one hundred fifty-five million, two hundred thirty-two thousand, two hundred".