21942238067 has 2 divisors, whose sum is σ = 21942238068. Its totient is φ = 21942238066.

The previous prime is 21942238051. The next prime is 21942238117. The reversal of 21942238067 is 76083224912.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21942238067 - 2⁴ = 21942238051 is a prime.

It is a super-2 number, since 2×21942238067² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21942235067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10971119033 + 10971119034.

It is an arithmetic number, because the mean of its divisors is an integer number (10971119034).

Almost surely, 2^21942238067 is an apocalyptic number.

21942238067 is a deficient number, since it is larger than the sum of its proper divisors (1).

21942238067 is an equidigital number, since it uses as much as digits as its factorization.

21942238067 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 290304, while the sum is 44.

The spelling of 21942238067 in words is "twenty-one billion, nine hundred forty-two million, two hundred thirty-eight thousand, sixty-seven".