21433411121 has 2 divisors, whose sum is σ = 21433411122. Its totient is φ = 21433411120.

The previous prime is 21433411063. The next prime is 21433411141. The reversal of 21433411121 is 12111433412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18838935025 + 2594476096 = 137255^2 + 50936^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21433411121 is a prime.

It is a super-2 number, since 2×21433411121² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21433411141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10716705560 + 10716705561.

It is an arithmetic number, because the mean of its divisors is an integer number (10716705561).

Almost surely, 2^21433411121 is an apocalyptic number.

It is an amenable number.

21433411121 is a deficient number, since it is larger than the sum of its proper divisors (1).

21433411121 is an equidigital number, since it uses as much as digits as its factorization.

21433411121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 576, while the sum is 23.

Adding to 21433411121 its reverse (12111433412), we get a palindrome (33544844533).

The spelling of 21433411121 in words is "twenty-one billion, four hundred thirty-three million, four hundred eleven thousand, one hundred twenty-one".