21070200 has 48 divisors (see below), whose sum is σ = 65319480. Its totient is φ = 5618560.

The previous prime is 21070121. The next prime is 21070201. The reversal of 21070200 is 207012.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21070201) 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, 16959 + ... + 18158.

Almost surely, 2^21070200 is an apocalyptic number.

21070200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21070200 is an abundant number, since it is smaller than the sum of its proper divisors (44249280).

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

21070200 is a wasteful number, since it uses less digits than its factorization.

21070200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35136 (or 35127 counting only the distinct ones).

The product of its (nonzero) digits is 28, while the sum is 12.

The square root of 21070200 is about 4590.2287524698. The cubic root of 21070200 is about 276.1994986955.

Adding to 21070200 its reverse (207012), we get a palindrome (21277212).

The spelling of 21070200 in words is "twenty-one million, seventy thousand, two hundred".