21769914 has 32 divisors (see below), whose sum is σ = 46076544. Its totient is φ = 6842880.

The previous prime is 21769907. The next prime is 21769931. The reversal of 21769914 is 41996712.

It is a Curzon number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 8994 + ... + 11154.

It is an arithmetic number, because the mean of its divisors is an integer number (1439892).

Almost surely, 2^21769914 is an apocalyptic number.

21769914 is an abundant number, since it is smaller than the sum of its proper divisors (24306630).

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

21769914 is a wasteful number, since it uses less digits than its factorization.

21769914 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2262.

The product of its digits is 27216, while the sum is 39.

The square root of 21769914 is about 4665.8240429746. The cubic root of 21769914 is about 279.2236743854.

It can be divided in two parts, 2176 and 9914, that added together give a triangular number (12090 = T₁₅₅).

The spelling of 21769914 in words is "twenty-one million, seven hundred sixty-nine thousand, nine hundred fourteen".