21213602033489 has 2 divisors, whose sum is σ = 21213602033490. Its totient is φ = 21213602033488.

The previous prime is 21213602033381. The next prime is 21213602033539. The reversal of 21213602033489 is 98433020631212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19651621990225 + 1561980043264 = 4433015^2 + 1249792^2 .

It is a cyclic number.

It is not a de Polignac number, because 21213602033489 - 2⁸ = 21213602033233 is a prime.

It is a super-2 number, since 2×21213602033489² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21213602035489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10606801016744 + 10606801016745.

It is an arithmetic number, because the mean of its divisors is an integer number (10606801016745).

Almost surely, 2^{21213602033489} is an apocalyptic number.

It is an amenable number.

21213602033489 is a deficient number, since it is larger than the sum of its proper divisors (1).

21213602033489 is an equidigital number, since it uses as much as digits as its factorization.

21213602033489 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 373248, while the sum is 44.

The spelling of 21213602033489 in words is "twenty-one trillion, two hundred thirteen billion, six hundred two million, thirty-three thousand, four hundred eighty-nine".