21354700 has 36 divisors (see below), whose sum is σ = 46637640. Its totient is φ = 8487040.

The previous prime is 21354667. The next prime is 21354721. The reversal of 21354700 is 745312.

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, 17304 + ... + 18496.

It is an arithmetic number, because the mean of its divisors is an integer number (1295490).

Almost surely, 2^21354700 is an apocalyptic number.

21354700 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 21354700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23318820).

21354700 is an abundant number, since it is smaller than the sum of its proper divisors (25282940).

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

21354700 is a wasteful number, since it uses less digits than its factorization.

21354700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1386 (or 1379 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 22.

The square root of 21354700 is about 4621.1145841669. The cubic root of 21354700 is about 277.4370714652.

The spelling of 21354700 in words is "twenty-one million, three hundred fifty-four thousand, seven hundred".