21111412013 has 4 divisors (see below), whose sum is σ = 21560591040. Its totient is φ = 20662232988.

The previous prime is 21111412009. The next prime is 21111412043. The reversal of 21111412013 is 31021411112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21111412013 - 2² = 21111412009 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21111411982 and 21111412000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21111412043) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 224589443 + ... + 224589536.

It is an arithmetic number, because the mean of its divisors is an integer number (5390147760).

Almost surely, 2^21111412013 is an apocalyptic number.

It is an amenable number.

21111412013 is a deficient number, since it is larger than the sum of its proper divisors (449179027).

21111412013 is an equidigital number, since it uses as much as digits as its factorization.

21111412013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 449179026.

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

Adding to 21111412013 its reverse (31021411112), we get a palindrome (52132823125).

Subtracting 21111412013 from its reverse (31021411112), we obtain a palindrome (9909999099).

The spelling of 21111412013 in words is "twenty-one billion, one hundred eleven million, four hundred twelve thousand, thirteen".