21833994 has 32 divisors (see below), whose sum is σ = 53746560. Its totient is φ = 5758272.

The previous prime is 21833963. The next prime is 21834011. The reversal of 21833994 is 49933812.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19449 + ... + 20540.

It is an arithmetic number, because the mean of its divisors is an integer number (1679580).

Almost surely, 2^21833994 is an apocalyptic number.

21833994 is an abundant number, since it is smaller than the sum of its proper divisors (31912566).

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

21833994 is a wasteful number, since it uses less digits than its factorization.

21833994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40014.

The product of its digits is 46656, while the sum is 39.

The square root of 21833994 is about 4672.6859513560. The cubic root of 21833994 is about 279.4973720822.

The spelling of 21833994 in words is "twenty-one million, eight hundred thirty-three thousand, nine hundred ninety-four".