21164414 has 4 divisors (see below), whose sum is σ = 31746624. Its totient is φ = 10582206.

The previous prime is 21164401. The next prime is 21164431. The reversal of 21164414 is 41446112.

It is a happy number.

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

It is a super-3 number, since 3×21164414³ (a number of 23 digits) contains 333 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21164414.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5291102 + ... + 5291105.

It is an arithmetic number, because the mean of its divisors is an integer number (7936656).

Almost surely, 2^21164414 is an apocalyptic number.

21164414 is a deficient number, since it is larger than the sum of its proper divisors (10582210).

21164414 is a wasteful number, since it uses less digits than its factorization.

21164414 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10582209.

The product of its digits is 768, while the sum is 23.

The square root of 21164414 is about 4600.4797575905. The cubic root of 21164414 is about 276.6105558698.

The spelling of 21164414 in words is "twenty-one million, one hundred sixty-four thousand, four hundred fourteen".