21612903413 has 2 divisors, whose sum is σ = 21612903414. Its totient is φ = 21612903412.

The previous prime is 21612903343. The next prime is 21612903451. The reversal of 21612903413 is 31430921612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14999635729 + 6613267684 = 122473^2 + 81322^2 .

It is a cyclic number.

It is not a de Polignac number, because 21612903413 - 2¹⁴ = 21612887029 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21612903413.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21612903463) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10806451706 + 10806451707.

It is an arithmetic number, because the mean of its divisors is an integer number (10806451707).

Almost surely, 2^21612903413 is an apocalyptic number.

It is an amenable number.

21612903413 is a deficient number, since it is larger than the sum of its proper divisors (1).

21612903413 is an equidigital number, since it uses as much as digits as its factorization.

21612903413 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 32.

The spelling of 21612903413 in words is "twenty-one billion, six hundred twelve million, nine hundred three thousand, four hundred thirteen".