21076626649 has 24 divisors (see below), whose sum is σ = 23111354112. Its totient is φ = 19107031680.

The previous prime is 21076626617. The next prime is 21076626677. The reversal of 21076626649 is 94662667012.

It is not a de Polignac number, because 21076626649 - 2⁵ = 21076626617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21076626689) 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 23 ways as a sum of consecutive naturals, for example, 21267544 + ... + 21268534.

It is an arithmetic number, because the mean of its divisors is an integer number (962973088).

Almost surely, 2^21076626649 is an apocalyptic number.

It is an amenable number.

21076626649 is a deficient number, since it is larger than the sum of its proper divisors (2034727463).

21076626649 is an equidigital number, since it uses as much as digits as its factorization.

21076626649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1457 (or 1384 counting only the distinct ones).

The product of its (nonzero) digits is 1306368, while the sum is 49.

The spelling of 21076626649 in words is "twenty-one billion, seventy-six million, six hundred twenty-six thousand, six hundred forty-nine".