21124114691 has 2 divisors, whose sum is σ = 21124114692. Its totient is φ = 21124114690.

The previous prime is 21124114607. The next prime is 21124114699. The reversal of 21124114691 is 19641142112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21124114691 - 2²² = 21119920387 is a prime.

It is not a weakly prime, because it can be changed into another prime (21124114699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10562057345 + 10562057346.

It is an arithmetic number, because the mean of its divisors is an integer number (10562057346).

Almost surely, 2^21124114691 is an apocalyptic number.

21124114691 is a deficient number, since it is larger than the sum of its proper divisors (1).

21124114691 is an equidigital number, since it uses as much as digits as its factorization.

21124114691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3456, while the sum is 32.

The spelling of 21124114691 in words is "twenty-one billion, one hundred twenty-four million, one hundred fourteen thousand, six hundred ninety-one".