21415020413 has 2 divisors, whose sum is σ = 21415020414. Its totient is φ = 21415020412.

The previous prime is 21415020371. The next prime is 21415020437. The reversal of 21415020413 is 31402051412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19295154649 + 2119865764 = 138907^2 + 46042^2 .

It is a cyclic number.

It is not a de Polignac number, because 21415020413 - 2⁶ = 21415020349 is a prime.

It is a super-3 number, since 3×21415020413³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21415020013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10707510206 + 10707510207.

It is an arithmetic number, because the mean of its divisors is an integer number (10707510207).

Almost surely, 2^21415020413 is an apocalyptic number.

It is an amenable number.

21415020413 is a deficient number, since it is larger than the sum of its proper divisors (1).

21415020413 is an equidigital number, since it uses as much as digits as its factorization.

21415020413 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 960, while the sum is 23.

Adding to 21415020413 its reverse (31402051412), we get a palindrome (52817071825).

The spelling of 21415020413 in words is "twenty-one billion, four hundred fifteen million, twenty thousand, four hundred thirteen".