21107481611 has 2 divisors, whose sum is σ = 21107481612. Its totient is φ = 21107481610.

The previous prime is 21107481607. The next prime is 21107481617. The reversal of 21107481611 is 11618470112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21107481611 - 2² = 21107481607 is a prime.

It is not a weakly prime, because it can be changed into another prime (21107481617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10553740805 + 10553740806.

It is an arithmetic number, because the mean of its divisors is an integer number (10553740806).

Almost surely, 2^21107481611 is an apocalyptic number.

21107481611 is a deficient number, since it is larger than the sum of its proper divisors (1).

21107481611 is an equidigital number, since it uses as much as digits as its factorization.

21107481611 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2688, while the sum is 32.

The spelling of 21107481611 in words is "twenty-one billion, one hundred seven million, four hundred eighty-one thousand, six hundred eleven".