21682402627 has 4 divisors (see below), whose sum is σ = 21711743560. Its totient is φ = 21653061696.

The previous prime is 21682402619. The next prime is 21682402697. The reversal of 21682402627 is 72620428612.

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 21682402627 - 2³ = 21682402619 is a prime.

It is a super-2 number, since 2×21682402627² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21682402627.

It is not an unprimeable number, because it can be changed into a prime (21682402697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14669358 + ... + 14670835.

It is an arithmetic number, because the mean of its divisors is an integer number (5427935890).

Almost surely, 2^21682402627 is an apocalyptic number.

21682402627 is a deficient number, since it is larger than the sum of its proper divisors (29340933).

21682402627 is an equidigital number, since it uses as much as digits as its factorization.

21682402627 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29340932.

The product of its (nonzero) digits is 129024, while the sum is 40.

The spelling of 21682402627 in words is "twenty-one billion, six hundred eighty-two million, four hundred two thousand, six hundred twenty-seven".