21867700 has 18 divisors (see below), whose sum is σ = 47453126. Its totient is φ = 8747040.

The previous prime is 21867691. The next prime is 21867709. The reversal of 21867700 is 776812.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21867691) and next prime (21867709).

It can be written as a sum of positive squares in 3 ways, for example, as 6170256 + 15697444 = 2484^2 + 3962^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21867709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 109239 + ... + 109438.

Almost surely, 2^21867700 is an apocalyptic number.

21867700 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21867700 is an abundant number, since it is smaller than the sum of its proper divisors (25585426).

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

21867700 is a wasteful number, since it uses less digits than its factorization.

21867700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218691 (or 218684 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 31.

The square root of 21867700 is about 4676.2912655223. The cubic root of 21867700 is about 279.6411218523.

The spelling of 21867700 in words is "twenty-one million, eight hundred sixty-seven thousand, seven hundred".