21401600 has 156 divisors (see below), whose sum is σ = 60941040. Its totient is φ = 7372800.

The previous prime is 21401593. The next prime is 21401617. The reversal of 21401600 is 610412.

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, 1126391 + ... + 1126409.

Almost surely, 2^21401600 is an apocalyptic number.

21401600 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 21401600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30470520).

21401600 is an abundant number, since it is smaller than the sum of its proper divisors (39539440).

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

21401600 is a wasteful number, since it uses less digits than its factorization.

21401600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64 (or 37 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 21401600 is about 4626.1863343363. The cubic root of 21401600 is about 277.6400288874.

The spelling of 21401600 in words is "twenty-one million, four hundred one thousand, six hundred".