21231133333 has 2 divisors, whose sum is σ = 21231133334. Its totient is φ = 21231133332.

The previous prime is 21231133309. The next prime is 21231133351. The reversal of 21231133333 is 33333113212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19275990244 + 1955143089 = 138838^2 + 44217^2 .

It is a cyclic number.

It is not a de Polignac number, because 21231133333 - 2²⁵ = 21197578901 is a prime.

It is a super-2 number, since 2×21231133333² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21231133298 and 21231133307.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21231133373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10615566666 + 10615566667.

It is an arithmetic number, because the mean of its divisors is an integer number (10615566667).

Almost surely, 2^21231133333 is an apocalyptic number.

It is an amenable number.

21231133333 is a deficient number, since it is larger than the sum of its proper divisors (1).

21231133333 is an equidigital number, since it uses as much as digits as its factorization.

21231133333 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2916, while the sum is 25.

Adding to 21231133333 its reverse (33333113212), we get a palindrome (54564246545).

The spelling of 21231133333 in words is "twenty-one billion, two hundred thirty-one million, one hundred thirty-three thousand, three hundred thirty-three".