21941958 has 8 divisors (see below), whose sum is σ = 43883928. Its totient is φ = 7313984.

The previous prime is 21941921. The next prime is 21941981. The reversal of 21941958 is 85914912.

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

21941958 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1828491 + ... + 1828502.

It is an arithmetic number, because the mean of its divisors is an integer number (5485491).

Almost surely, 2^21941958 is an apocalyptic number.

21941958 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.

21941958 is a wasteful number, since it uses less digits than its factorization.

21941958 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3656998.

The product of its digits is 25920, while the sum is 39.

The square root of 21941958 is about 4684.2243754970. The cubic root of 21941958 is about 279.9572979097.

The spelling of 21941958 in words is "twenty-one million, nine hundred forty-one thousand, nine hundred fifty-eight".