21240370700 has 36 divisors (see below), whose sum is σ = 46547979072. Its totient is φ = 8412024000.

The previous prime is 21240370667. The next prime is 21240370703. The reversal of 21240370700 is 707304212.

It is a self number, because there is not a number n which added to its sum of digits gives 21240370700.

It is not an unprimeable number, because it can be changed into a prime (21240370703) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1041404 + ... + 1061603.

Almost surely, 2^21240370700 is an apocalyptic number.

21240370700 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21240370700 is an abundant number, since it is smaller than the sum of its proper divisors (25307608372).

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

21240370700 is a wasteful number, since it uses less digits than its factorization.

21240370700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2103122 (or 2103115 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 26.

Adding to 21240370700 its reverse (707304212), we get a palindrome (21947674912).

The spelling of 21240370700 in words is "twenty-one billion, two hundred forty million, three hundred seventy thousand, seven hundred".