21900678 has 8 divisors (see below), whose sum is σ = 43801368. Its totient is φ = 7300224.

The previous prime is 21900677. The next prime is 21900679. The reversal of 21900678 is 87600912.

It is an interprime number because it is at equal distance from previous prime (21900677) and next prime (21900679).

It is a sphenic number, since it is the product of 3 distinct primes.

21900678 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21900677) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1825051 + ... + 1825062.

It is an arithmetic number, because the mean of its divisors is an integer number (5475171).

Almost surely, 2^21900678 is an apocalyptic number.

21900678 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21900678 is a wasteful number, since it uses less digits than its factorization.

21900678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3650118.

The product of its (nonzero) digits is 6048, while the sum is 33.

The square root of 21900678 is about 4679.8160220248. The cubic root of 21900678 is about 279.7816239473.

It can be divided in two parts, 21900 and 678, that added together give a triangular number (22578 = T₂₁₂).

The spelling of 21900678 in words is "twenty-one million, nine hundred thousand, six hundred seventy-eight".