21113767400 has 96 divisors (see below), whose sum is σ = 53622907200. Its totient is φ = 7667596800.

The previous prime is 21113767391. The next prime is 21113767459. The reversal of 21113767400 is 476731112.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1773869 + ... + 1785731.

It is an arithmetic number, because the mean of its divisors is an integer number (558571950).

Almost surely, 2^21113767400 is an apocalyptic number.

21113767400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21113767400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26811453600).

21113767400 is an abundant number, since it is smaller than the sum of its proper divisors (32509139800).

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

21113767400 is a wasteful number, since it uses less digits than its factorization.

21113767400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12699 (or 12690 counting only the distinct ones).

The product of its (nonzero) digits is 7056, while the sum is 32.

The spelling of 21113767400 in words is "twenty-one billion, one hundred thirteen million, seven hundred sixty-seven thousand, four hundred".