21396862763 has 4 divisors (see below), whose sum is σ = 22327161168. Its totient is φ = 20466564360.

The previous prime is 21396862703. The next prime is 21396862777. The reversal of 21396862763 is 36726869312.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21396862763 - 2¹² = 21396858667 is a prime.

It is a super-3 number, since 3×21396862763³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21396862703) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 465149168 + ... + 465149213.

It is an arithmetic number, because the mean of its divisors is an integer number (5581790292).

Almost surely, 2^21396862763 is an apocalyptic number.

21396862763 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21396862763 is a deficient number, since it is larger than the sum of its proper divisors (930298405).

21396862763 is an equidigital number, since it uses as much as digits as its factorization.

21396862763 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 930298404.

The product of its digits is 3919104, while the sum is 53.

The spelling of 21396862763 in words is "twenty-one billion, three hundred ninety-six million, eight hundred sixty-two thousand, seven hundred sixty-three".