21013412111 has 2 divisors, whose sum is σ = 21013412112. Its totient is φ = 21013412110.

The previous prime is 21013412107. The next prime is 21013412137. The reversal of 21013412111 is 11121431012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21013412111 - 2² = 21013412107 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21013412111.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21013412011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10506706055 + 10506706056.

It is an arithmetic number, because the mean of its divisors is an integer number (10506706056).

Almost surely, 2^21013412111 is an apocalyptic number.

21013412111 is a deficient number, since it is larger than the sum of its proper divisors (1).

21013412111 is an equidigital number, since it uses as much as digits as its factorization.

21013412111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 21013412111 its reverse (11121431012), we get a palindrome (32134843123).

The spelling of 21013412111 in words is "twenty-one billion, thirteen million, four hundred twelve thousand, one hundred eleven".