21106958 has 8 divisors (see below), whose sum is σ = 31718952. Its totient is φ = 10533976.

The previous prime is 21106957. The next prime is 21106961. The reversal of 21106958 is 85960112.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21106957) 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, 8360 + ... + 10587.

It is an arithmetic number, because the mean of its divisors is an integer number (3964869).

Almost surely, 2^21106958 is an apocalyptic number.

21106958 is a deficient number, since it is larger than the sum of its proper divisors (10611994).

21106958 is a wasteful number, since it uses less digits than its factorization.

21106958 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19506.

The product of its (nonzero) digits is 4320, while the sum is 32.

The square root of 21106958 is about 4594.2309476125. The cubic root of 21106958 is about 276.3600199217.

The spelling of 21106958 in words is "twenty-one million, one hundred six thousand, nine hundred fifty-eight".