21951834 has 8 divisors (see below), whose sum is σ = 43903680. Its totient is φ = 7317276.

The previous prime is 21951833. The next prime is 21951847. The reversal of 21951834 is 43815912.

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

21951834 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 21951795 and 21951804.

It is not an unprimeable number, because it can be changed into a prime (21951833) 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, 1829314 + ... + 1829325.

It is an arithmetic number, because the mean of its divisors is an integer number (5487960).

Almost surely, 2^21951834 is an apocalyptic number.

21951834 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.

21951834 is a wasteful number, since it uses less digits than its factorization.

21951834 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3658644.

The product of its digits is 8640, while the sum is 33.

The square root of 21951834 is about 4685.2784335619. The cubic root of 21951834 is about 279.9992942159. Note that the first 3 decimals are identical.

The spelling of 21951834 in words is "twenty-one million, nine hundred fifty-one thousand, eight hundred thirty-four".