21513200 has 30 divisors (see below), whose sum is σ = 51686424. Its totient is φ = 8605120.

The previous prime is 21513197. The next prime is 21513203. The reversal of 21513200 is 231512.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21513197) and next prime (21513203).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21513203) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 26492 + ... + 27291.

Almost surely, 2^21513200 is an apocalyptic number.

21513200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21513200 is an abundant number, since it is smaller than the sum of its proper divisors (30173224).

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

21513200 is a wasteful number, since it uses less digits than its factorization.

21513200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53801 (or 53790 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 14.

The square root of 21513200 is about 4638.2324219470. The cubic root of 21513200 is about 278.1217829868.

Adding to 21513200 its reverse (231512), we get a palindrome (21744712).

The spelling of 21513200 in words is "twenty-one million, five hundred thirteen thousand, two hundred".