21969964519 has 2 divisors, whose sum is σ = 21969964520. Its totient is φ = 21969964518.

The previous prime is 21969964453. The next prime is 21969964531. The reversal of 21969964519 is 91546996912.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21969964519 - 2²¹ = 21967867367 is a prime.

It is a super-2 number, since 2×21969964519² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21969964589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10984982259 + 10984982260.

It is an arithmetic number, because the mean of its divisors is an integer number (10984982260).

Almost surely, 2^21969964519 is an apocalyptic number.

21969964519 is a deficient number, since it is larger than the sum of its proper divisors (1).

21969964519 is an equidigital number, since it uses as much as digits as its factorization.

21969964519 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9447840, while the sum is 61.

The spelling of 21969964519 in words is "twenty-one billion, nine hundred sixty-nine million, nine hundred sixty-four thousand, five hundred nineteen".