21029200 has 60 divisors (see below), whose sum is σ = 53200960. Its totient is φ = 7966080.

The previous prime is 21029189. The next prime is 21029207. The reversal of 21029200 is 292012.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21029207) 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, 6217 + ... + 8983.

Almost surely, 2^21029200 is an apocalyptic number.

21029200 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 21029200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26600480).

21029200 is an abundant number, since it is smaller than the sum of its proper divisors (32171760).

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

21029200 is a wasteful number, since it uses less digits than its factorization.

21029200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2804 (or 2793 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 21029200 is about 4585.7605694148. The cubic root of 21029200 is about 276.0202323612.

The spelling of 21029200 in words is "twenty-one million, twenty-nine thousand, two hundred".