21934207 has 2 divisors, whose sum is σ = 21934208. Its totient is φ = 21934206.

The previous prime is 21934201. The next prime is 21934219. The reversal of 21934207 is 70243912.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21934207 - 2⁷ = 21934079 is a prime.

It is a super-2 number, since 2×21934207² = 962218873437698, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21934201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10967103 + 10967104.

It is an arithmetic number, because the mean of its divisors is an integer number (10967104).

Almost surely, 2^21934207 is an apocalyptic number.

21934207 is a deficient number, since it is larger than the sum of its proper divisors (1).

21934207 is an equidigital number, since it uses as much as digits as its factorization.

21934207 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 21934207 is about 4683.3969509321. The cubic root of 21934207 is about 279.9243290413.

It can be divided in two parts, 2193 and 4207, that added together give a square (6400 = 80²).

The spelling of 21934207 in words is "twenty-one million, nine hundred thirty-four thousand, two hundred seven".