21364958 has 4 divisors (see below), whose sum is σ = 32047440. Its totient is φ = 10682478.

The previous prime is 21364951. The next prime is 21364991. The reversal of 21364958 is 85946312.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×21364958² = 912922860683528, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21364951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5341238 + ... + 5341241.

It is an arithmetic number, because the mean of its divisors is an integer number (8011860).

Almost surely, 2^21364958 is an apocalyptic number.

21364958 is a deficient number, since it is larger than the sum of its proper divisors (10682482).

21364958 is a wasteful number, since it uses less digits than its factorization.

21364958 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10682481.

The product of its digits is 51840, while the sum is 38.

The square root of 21364958 is about 4622.2243563029. The cubic root of 21364958 is about 277.4814878217.

It can be divided in two parts, 21364 and 958, that added together give a palindrome (22322).

The spelling of 21364958 in words is "twenty-one million, three hundred sixty-four thousand, nine hundred fifty-eight".