21211120233 has 6 divisors (see below), whose sum is σ = 30638284794. Its totient is φ = 14140746816.

The previous prime is 21211120207. The next prime is 21211120253. The reversal of 21211120233 is 33202111212.

It can be written as a sum of positive squares in only one way, i.e., 12913367769 + 8297752464 = 113637^2 + 91092^2 .

It is not a de Polignac number, because 21211120233 - 2¹⁷ = 21210989161 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21211120253) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1178395560 + ... + 1178395577.

It is an arithmetic number, because the mean of its divisors is an integer number (5106380799).

Almost surely, 2^21211120233 is an apocalyptic number.

It is an amenable number.

21211120233 is a deficient number, since it is larger than the sum of its proper divisors (9427164561).

21211120233 is a wasteful number, since it uses less digits than its factorization.

21211120233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2356791143 (or 2356791140 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21211120233 its reverse (33202111212), we get a palindrome (54413231445).

The spelling of 21211120233 in words is "twenty-one billion, two hundred eleven million, one hundred twenty thousand, two hundred thirty-three".