21011230111033 has 8 divisors (see below), whose sum is σ = 21019848026760. Its totient is φ = 21002612991360.

The previous prime is 21011230111019. The next prime is 21011230111063. The reversal of 21011230111033 is 33011103211012.

It can be written as a sum of positive squares in 4 ways, for example, as 1778374272249 + 19232855838784 = 1333557^2 + 4385528^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21011230111033 - 2³⁷ = 20873791157561 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21011230111033.

It is not an unprimeable number, because it can be changed into a prime (21011230111063) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55811133 + ... + 56186341.

It is an arithmetic number, because the mean of its divisors is an integer number (2627481003345).

Almost surely, 2^{21011230111033} is an apocalyptic number.

It is an amenable number.

21011230111033 is a deficient number, since it is larger than the sum of its proper divisors (8617915727).

21011230111033 is a wasteful number, since it uses less digits than its factorization.

21011230111033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 398027.

The product of its (nonzero) digits is 108, while the sum is 19.

Adding to 21011230111033 its reverse (33011103211012), we get a palindrome (54022333322045).

The spelling of 21011230111033 in words is "twenty-one trillion, eleven billion, two hundred thirty million, one hundred eleven thousand, thirty-three".