21934771 has 4 divisors (see below), whose sum is σ = 22102344. Its totient is φ = 21767200.

The previous prime is 21934753. The next prime is 21934789. The reversal of 21934771 is 17743912.

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

It is an interprime number because it is at equal distance from previous prime (21934753) and next prime (21934789).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21934771 is a prime.

It is a super-2 number, since 2×21934771² = 962268357644882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21934711) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83590 + ... + 83851.

It is an arithmetic number, because the mean of its divisors is an integer number (5525586).

Almost surely, 2^21934771 is an apocalyptic number.

21934771 is a deficient number, since it is larger than the sum of its proper divisors (167573).

21934771 is a wasteful number, since it uses less digits than its factorization.

21934771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167572.

The product of its digits is 10584, while the sum is 34.

The square root of 21934771 is about 4683.4571632502. The cubic root of 21934771 is about 279.9267282766.

The spelling of 21934771 in words is "twenty-one million, nine hundred thirty-four thousand, seven hundred seventy-one".