21215035033 has 2 divisors, whose sum is σ = 21215035034. Its totient is φ = 21215035032.

The previous prime is 21215035027. The next prime is 21215035069. The reversal of 21215035033 is 33053051212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21198486409 + 16548624 = 145597^2 + 4068^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21215035033 is a prime.

It is a super-2 number, since 2×21215035033² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21215034989 and 21215035007.

It is not a weakly prime, because it can be changed into another prime (21215035003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10607517516 + 10607517517.

It is an arithmetic number, because the mean of its divisors is an integer number (10607517517).

Almost surely, 2^21215035033 is an apocalyptic number.

It is an amenable number.

21215035033 is a deficient number, since it is larger than the sum of its proper divisors (1).

21215035033 is an equidigital number, since it uses as much as digits as its factorization.

21215035033 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2700, while the sum is 25.

Adding to 21215035033 its reverse (33053051212), we get a palindrome (54268086245).

The spelling of 21215035033 in words is "twenty-one billion, two hundred fifteen million, thirty-five thousand, thirty-three".