21213610645033 has 2 divisors, whose sum is σ = 21213610645034. Its totient is φ = 21213610645032.

The previous prime is 21213610645021. The next prime is 21213610645057. The reversal of 21213610645033 is 33054601631212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19393075715049 + 1820534929984 = 4403757^2 + 1349272^2 .

It is a cyclic number.

It is not a de Polignac number, because 21213610645033 - 2¹⁷ = 21213610513961 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21213610644983 and 21213610645001.

It is not a weakly prime, because it can be changed into another prime (21213610655033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10606805322516 + 10606805322517.

It is an arithmetic number, because the mean of its divisors is an integer number (10606805322517).

Almost surely, 2^{21213610645033} is an apocalyptic number.

It is an amenable number.

21213610645033 is a deficient number, since it is larger than the sum of its proper divisors (1).

21213610645033 is an equidigital number, since it uses as much as digits as its factorization.

21213610645033 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 77760, while the sum is 37.

The spelling of 21213610645033 in words is "twenty-one trillion, two hundred thirteen billion, six hundred ten million, six hundred forty-five thousand, thirty-three".