21145232200 has 48 divisors (see below), whose sum is σ = 49222496880. Its totient is φ = 8447799360.

The previous prime is 21145232167. The next prime is 21145232233. The reversal of 21145232200 is 223254112.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21145232167) and next prime (21145232233).

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, 101479 + ... + 229321.

It is an arithmetic number, because the mean of its divisors is an integer number (1025468685).

Almost surely, 2^21145232200 is an apocalyptic number.

21145232200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21145232200 is an abundant number, since it is smaller than the sum of its proper divisors (28077264680).

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

21145232200 is a wasteful number, since it uses less digits than its factorization.

21145232200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128686 (or 128677 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

Adding to 21145232200 its reverse (223254112), we get a palindrome (21368486312).

The spelling of 21145232200 in words is "twenty-one billion, one hundred forty-five million, two hundred thirty-two thousand, two hundred".