21946123 has 2 divisors, whose sum is σ = 21946124. Its totient is φ = 21946122.

The previous prime is 21946103. The next prime is 21946139. The reversal of 21946123 is 32164912.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21946123 - 2¹³ = 21937931 is a prime.

It is a super-2 number, since 2×21946123² = 963264629462258, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21946091 and 21946100.

It is not a weakly prime, because it can be changed into another prime (21946103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10973061 + 10973062.

It is an arithmetic number, because the mean of its divisors is an integer number (10973062).

Almost surely, 2^21946123 is an apocalyptic number.

21946123 is a deficient number, since it is larger than the sum of its proper divisors (1).

21946123 is an equidigital number, since it uses as much as digits as its factorization.

21946123 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2592, while the sum is 28.

The square root of 21946123 is about 4684.6689317389. The cubic root of 21946123 is about 279.9750105249.

The spelling of 21946123 in words is "twenty-one million, nine hundred forty-six thousand, one hundred twenty-three".