21004700 has 36 divisors (see below), whose sum is σ = 47158440. Its totient is φ = 8111040.

The previous prime is 21004691. The next prime is 21004721. The reversal of 21004700 is 740012.

It is a happy number.

It is a congruent number.

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, 722 + ... + 6521.

Almost surely, 2^21004700 is an apocalyptic number.

21004700 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21004700 is an abundant number, since it is smaller than the sum of its proper divisors (26153740).

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

21004700 is a wasteful number, since it uses less digits than its factorization.

21004700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7286 (or 7279 counting only the distinct ones).

The product of its (nonzero) digits is 56, while the sum is 14.

The square root of 21004700 is about 4583.0884783081. The cubic root of 21004700 is about 275.9129985530.

Adding to 21004700 its reverse (740012), we get a palindrome (21744712).

The spelling of 21004700 in words is "twenty-one million, four thousand, seven hundred".