21263700 has 36 divisors (see below), whose sum is σ = 61523840. Its totient is φ = 5670240.

The previous prime is 21263677. The next prime is 21263701. The reversal of 21263700 is 736212.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21263701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 35140 + ... + 35739.

Almost surely, 2^21263700 is an apocalyptic number.

21263700 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21263700 is an abundant number, since it is smaller than the sum of its proper divisors (40260140).

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

21263700 is a wasteful number, since it uses less digits than its factorization.

21263700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70896 (or 70889 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 21.

The square root of 21263700 is about 4611.2579628557. The cubic root of 21263700 is about 277.0424242215.

Adding to 21263700 its reverse (736212), we get a palindrome (21999912).

The spelling of 21263700 in words is "twenty-one million, two hundred sixty-three thousand, seven hundred".