21211220233 has 8 divisors (see below), whose sum is σ = 24251216768. Its totient is φ = 18173679264.

The previous prime is 21211220227. The next prime is 21211220237. The reversal of 21211220233 is 33202211212.

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 21211220233 - 2¹³ = 21211212041 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 21211220233.

It is not an unprimeable number, because it can be changed into a prime (21211220237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 595341 + ... + 629962.

It is an arithmetic number, because the mean of its divisors is an integer number (3031402096).

Almost surely, 2^21211220233 is an apocalyptic number.

It is an amenable number.

21211220233 is a deficient number, since it is larger than the sum of its proper divisors (3039996535).

21211220233 is a wasteful number, since it uses less digits than its factorization.

21211220233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1227783.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21211220233 its reverse (33202211212), we get a palindrome (54413431445).

The spelling of 21211220233 in words is "twenty-one billion, two hundred eleven million, two hundred twenty thousand, two hundred thirty-three".