21900294 has 40 divisors (see below), whose sum is σ = 52852800. Its totient is φ = 6737904.

The previous prime is 21900283. The next prime is 21900299. The reversal of 21900294 is 49200912.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21900299) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 3094 + ... + 7305.

It is an arithmetic number, because the mean of its divisors is an integer number (1321320).

Almost surely, 2^21900294 is an apocalyptic number.

21900294 is an abundant number, since it is smaller than the sum of its proper divisors (30952506).

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

21900294 is a wasteful number, since it uses less digits than its factorization.

21900294 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10426 (or 10417 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 21900294 is about 4679.7749945911. The cubic root of 21900294 is about 279.7799887351.

The spelling of 21900294 in words is "twenty-one million, nine hundred thousand, two hundred ninety-four".