21111214133 has 4 divisors (see below), whose sum is σ = 21115438848. Its totient is φ = 21106989420.

The previous prime is 21111214123. The next prime is 21111214141. The reversal of 21111214133 is 33141211112.

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 21111214133 - 2¹² = 21111210037 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21111214123) 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, 2104853 + ... + 2114858.

It is an arithmetic number, because the mean of its divisors is an integer number (5278859712).

Almost surely, 2^21111214133 is an apocalyptic number.

It is an amenable number.

21111214133 is a deficient number, since it is larger than the sum of its proper divisors (4224715).

21111214133 is an equidigital number, since it uses as much as digits as its factorization.

21111214133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4224714.

The product of its digits is 144, while the sum is 20.

Adding to 21111214133 its reverse (33141211112), we get a palindrome (54252425245).

The spelling of 21111214133 in words is "twenty-one billion, one hundred eleven million, two hundred fourteen thousand, one hundred thirty-three".