21021111103133 has 4 divisors (see below), whose sum is σ = 21021340155648. Its totient is φ = 21020882050620.

The previous prime is 21021111103129. The next prime is 21021111103189. The reversal of 21021111103133 is 33130111112012.

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 21021111103133 - 2² = 21021111103129 is a prime.

It is a super-2 number, since 2×21021111103133² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21021111103633) 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, 114388541 + ... + 114572162.

It is an arithmetic number, because the mean of its divisors is an integer number (5255335038912).

Almost surely, 2^{21021111103133} is an apocalyptic number.

It is an amenable number.

21021111103133 is a deficient number, since it is larger than the sum of its proper divisors (229052515).

21021111103133 is an equidigital number, since it uses as much as digits as its factorization.

21021111103133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229052514.

The product of its (nonzero) digits is 108, while the sum is 20.

Adding to 21021111103133 its reverse (33130111112012), we get a palindrome (54151222215145).

The spelling of 21021111103133 in words is "twenty-one trillion, twenty-one billion, one hundred eleven million, one hundred three thousand, one hundred thirty-three".