21495700 has 36 divisors (see below), whose sum is σ = 47740000. Its totient is φ = 8396640.

The previous prime is 21495673. The next prime is 21495703. The reversal of 21495700 is 759412.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21495703) 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, 1801 + ... + 6799.

Almost surely, 2^21495700 is an apocalyptic number.

21495700 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 21495700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23870000).

21495700 is an abundant number, since it is smaller than the sum of its proper divisors (26244300).

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

21495700 is a wasteful number, since it uses less digits than its factorization.

21495700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5056 (or 5049 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 21495700 is about 4636.3455436367. The cubic root of 21495700 is about 278.0463494309.

The spelling of 21495700 in words is "twenty-one million, four hundred ninety-five thousand, seven hundred".