21167863413 has 4 divisors (see below), whose sum is σ = 28223817888. Its totient is φ = 14111908940.

The previous prime is 21167863403. The next prime is 21167863433. The reversal of 21167863413 is 31436876112.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21167863413 - 2³³ = 12577928821 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21167863403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3527977233 + ... + 3527977238.

It is an arithmetic number, because the mean of its divisors is an integer number (7055954472).

Almost surely, 2^21167863413 is an apocalyptic number.

It is an amenable number.

21167863413 is a deficient number, since it is larger than the sum of its proper divisors (7055954475).

21167863413 is an equidigital number, since it uses as much as digits as its factorization.

21167863413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7055954474.

The product of its digits is 145152, while the sum is 42.

The spelling of 21167863413 in words is "twenty-one billion, one hundred sixty-seven million, eight hundred sixty-three thousand, four hundred thirteen".