21934078 has 16 divisors (see below), whose sum is σ = 33500880. Its totient is φ = 10768896.

The previous prime is 21934067. The next prime is 21934079. The reversal of 21934078 is 87043912.

It is a super-2 number, since 2×21934078² = 962207555420168, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21934079) 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, 37726 + ... + 38302.

It is an arithmetic number, because the mean of its divisors is an integer number (2093805).

Almost surely, 2^21934078 is an apocalyptic number.

21934078 is a deficient number, since it is larger than the sum of its proper divisors (11566802).

21934078 is a wasteful number, since it uses less digits than its factorization.

21934078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 891.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 21934078 is about 4683.3831788569. The cubic root of 21934078 is about 279.9237802743.

The spelling of 21934078 in words is "twenty-one million, nine hundred thirty-four thousand, seventy-eight".