21012111220233 has 8 divisors (see below), whose sum is σ = 32018455192768. Its totient is φ = 12006920697264.

The previous prime is 21012111220213. The next prime is 21012111220237. The reversal of 21012111220233 is 33202211121012.

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

It is not a de Polignac number, because 21012111220233 - 2¹⁴ = 21012111203849 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 1000576724773 = 21012111220233 / (2 + 1 + 0 + 1 + 2 + 1 + 1 + 1 + 2 + 2 + 0 + 2 + 3 + 3).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21012111220237) 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, 500288362366 + ... + 500288362407.

It is an arithmetic number, because the mean of its divisors is an integer number (4002306899096).

Almost surely, 2^{21012111220233} is an apocalyptic number.

It is an amenable number.

21012111220233 is a deficient number, since it is larger than the sum of its proper divisors (11006343972535).

21012111220233 is a wasteful number, since it uses less digits than its factorization.

21012111220233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1000576724783.

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 21012111220233 its reverse (33202211121012), we get a palindrome (54214322341245).

The spelling of 21012111220233 in words is "twenty-one trillion, twelve billion, one hundred eleven million, two hundred twenty thousand, two hundred thirty-three".