21406632314519 has 2 divisors, whose sum is σ = 21406632314520. Its totient is φ = 21406632314518.

The previous prime is 21406632314437. The next prime is 21406632314527. The reversal of 21406632314519 is 91541323660412.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21406632314519 - 2¹⁶ = 21406632248983 is a prime.

It is a super-2 number, since 2×21406632314519² (a number of 27 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21406632344519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10703316157259 + 10703316157260.

It is an arithmetic number, because the mean of its divisors is an integer number (10703316157260).

Almost surely, 2^{21406632314519} is an apocalyptic number.

21406632314519 is a deficient number, since it is larger than the sum of its proper divisors (1).

21406632314519 is an equidigital number, since it uses as much as digits as its factorization.

21406632314519 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 933120, while the sum is 47.

The spelling of 21406632314519 in words is "twenty-one trillion, four hundred six billion, six hundred thirty-two million, three hundred fourteen thousand, five hundred nineteen".