21092958 has 48 divisors (see below), whose sum is σ = 47763456. Its totient is φ = 6719760.

The previous prime is 21092957. The next prime is 21092969. The reversal of 21092958 is 85929012.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21092957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 57291 + ... + 57657.

It is an arithmetic number, because the mean of its divisors is an integer number (995072).

Almost surely, 2^21092958 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21092958, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23881728).

21092958 is an abundant number, since it is smaller than the sum of its proper divisors (26670498).

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

21092958 is a wasteful number, since it uses less digits than its factorization.

21092958 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 509 (or 506 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 21092958 is about 4592.7070448702. The cubic root of 21092958 is about 276.2989042772.

The spelling of 21092958 in words is "twenty-one million, ninety-two thousand, nine hundred fifty-eight".