21262719867 has 4 divisors (see below), whose sum is σ = 28350293160. Its totient is φ = 14175146576.

The previous prime is 21262719853. The next prime is 21262719889. The reversal of 21262719867 is 76891726212.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21262719867 is a prime.

It is a super-2 number, since 2×21262719867² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21262719827) 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, 3543786642 + ... + 3543786647.

It is an arithmetic number, because the mean of its divisors is an integer number (7087573290).

Almost surely, 2^21262719867 is an apocalyptic number.

21262719867 is a deficient number, since it is larger than the sum of its proper divisors (7087573293).

21262719867 is an equidigital number, since it uses as much as digits as its factorization.

21262719867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7087573292.

The product of its digits is 1016064, while the sum is 51.

The spelling of 21262719867 in words is "twenty-one billion, two hundred sixty-two million, seven hundred nineteen thousand, eight hundred sixty-seven".