21210210187433 has 2 divisors, whose sum is σ = 21210210187434. Its totient is φ = 21210210187432.

The previous prime is 21210210187391. The next prime is 21210210187451. The reversal of 21210210187433 is 33478101201212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11605931935504 + 9604278251929 = 3406748^2 + 3099077^2 .

It is a cyclic number.

It is not a de Polignac number, because 21210210187433 - 2¹⁶ = 21210210121897 is a prime.

It is a super-2 number, since 2×21210210187433² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21210210187393 and 21210210187402.

It is not a weakly prime, because it can be changed into another prime (21210210187483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10605105093716 + 10605105093717.

It is an arithmetic number, because the mean of its divisors is an integer number (10605105093717).

Almost surely, 2^{21210210187433} is an apocalyptic number.

It is an amenable number.

21210210187433 is a deficient number, since it is larger than the sum of its proper divisors (1).

21210210187433 is an equidigital number, since it uses as much as digits as its factorization.

21210210187433 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16128, while the sum is 35.

Adding to 21210210187433 its reverse (33478101201212), we get a palindrome (54688311388645).

The spelling of 21210210187433 in words is "twenty-one trillion, two hundred ten billion, two hundred ten million, one hundred eighty-seven thousand, four hundred thirty-three".