21940927 has 2 divisors, whose sum is σ = 21940928. Its totient is φ = 21940926.

The previous prime is 21940913. The next prime is 21940943. The reversal of 21940927 is 72904912.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21940927 - 2⁷ = 21940799 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21940892 and 21940901.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21940027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10970463 + 10970464.

It is an arithmetic number, because the mean of its divisors is an integer number (10970464).

Almost surely, 2^21940927 is an apocalyptic number.

21940927 is a deficient number, since it is larger than the sum of its proper divisors (1).

21940927 is an equidigital number, since it uses as much as digits as its factorization.

21940927 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 21940927 is about 4684.1143239678. The cubic root of 21940927 is about 279.9529130003.

The spelling of 21940927 in words is "twenty-one million, nine hundred forty thousand, nine hundred twenty-seven".