21101111133233 has 4 divisors (see below), whose sum is σ = 21217691857908. Its totient is φ = 20984530408560.

The previous prime is 21101111133229. The next prime is 21101111133301. The reversal of 21101111133233 is 33233111110112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5624377466929 + 15476733666304 = 2371577^2 + 3934048^2 .

It is a cyclic number.

It is not a de Polignac number, because 21101111133233 - 2² = 21101111133229 is a prime.

It is a super-2 number, since 2×21101111133233² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21101111133199 and 21101111133208.

It is not an unprimeable number, because it can be changed into a prime (21101111133203) 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, 58290362066 + ... + 58290362427.

It is an arithmetic number, because the mean of its divisors is an integer number (5304422964477).

Almost surely, 2^{21101111133233} is an apocalyptic number.

It is an amenable number.

21101111133233 is a deficient number, since it is larger than the sum of its proper divisors (116580724675).

21101111133233 is a wasteful number, since it uses less digits than its factorization.

21101111133233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116580724674.

The product of its (nonzero) digits is 324, while the sum is 23.

Adding to 21101111133233 its reverse (33233111110112), we get a palindrome (54334222243345).

The spelling of 21101111133233 in words is "twenty-one trillion, one hundred one billion, one hundred eleven million, one hundred thirty-three thousand, two hundred thirty-three".