21063700 has 36 divisors (see below), whose sum is σ = 52239712. Its totient is φ = 7221600.

The previous prime is 21063689. The next prime is 21063701. The reversal of 21063700 is 736012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21063701) 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, 14346 + ... + 15745.

Almost surely, 2^21063700 is an apocalyptic number.

21063700 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21063700 is an abundant number, since it is smaller than the sum of its proper divisors (31176012).

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

21063700 is a wasteful number, since it uses less digits than its factorization.

21063700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30112 (or 30105 counting only the distinct ones).

The product of its (nonzero) digits is 252, while the sum is 19.

The square root of 21063700 is about 4589.5206721400. The cubic root of 21063700 is about 276.1710939440.

Adding to 21063700 its reverse (736012), we get a palindrome (21799712).

The spelling of 21063700 in words is "twenty-one million, sixty-three thousand, seven hundred".