21076621211 has 4 divisors (see below), whose sum is σ = 21077388072. Its totient is φ = 21075854352.

The previous prime is 21076621193. The next prime is 21076621213. The reversal of 21076621211 is 11212667012.

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 21076621211 - 2⁶ = 21076621147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21076621213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 340610 + ... + 397703.

It is an arithmetic number, because the mean of its divisors is an integer number (5269347018).

Almost surely, 2^21076621211 is an apocalyptic number.

21076621211 is a deficient number, since it is larger than the sum of its proper divisors (766861).

21076621211 is an equidigital number, since it uses as much as digits as its factorization.

21076621211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 766860.

The product of its (nonzero) digits is 2016, while the sum is 29.

The spelling of 21076621211 in words is "twenty-one billion, seventy-six million, six hundred twenty-one thousand, two hundred eleven".