21190958 has 8 divisors (see below), whose sum is σ = 33168528. Its totient is φ = 10134784.

The previous prime is 21190957. The next prime is 21190963. The reversal of 21190958 is 85909112.

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21190957) 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, 230291 + ... + 230382.

It is an arithmetic number, because the mean of its divisors is an integer number (4146066).

Almost surely, 2^21190958 is an apocalyptic number.

21190958 is a deficient number, since it is larger than the sum of its proper divisors (11977570).

21190958 is a wasteful number, since it uses less digits than its factorization.

21190958 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 460698.

The product of its (nonzero) digits is 6480, while the sum is 35.

The square root of 21190958 is about 4603.3637701142. The cubic root of 21190958 is about 276.7261474345.

The spelling of 21190958 in words is "twenty-one million, one hundred ninety thousand, nine hundred fifty-eight".