21914078 has 16 divisors (see below), whose sum is σ = 34421760. Its totient is φ = 10443576.

The previous prime is 21914077. The next prime is 21914093. The reversal of 21914078 is 87041912.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21914077) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15851 + ... + 17177.

It is an arithmetic number, because the mean of its divisors is an integer number (2151360).

Almost surely, 2^21914078 is an apocalyptic number.

21914078 is a deficient number, since it is larger than the sum of its proper divisors (12507682).

21914078 is a wasteful number, since it uses less digits than its factorization.

21914078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1711.

The product of its (nonzero) digits is 4032, while the sum is 32.

The square root of 21914078 is about 4681.2474833104. The cubic root of 21914078 is about 279.8386740745.

The spelling of 21914078 in words is "twenty-one million, nine hundred fourteen thousand, seventy-eight".