21221122519 has 2 divisors, whose sum is σ = 21221122520. Its totient is φ = 21221122518.

The previous prime is 21221122499. The next prime is 21221122541. The reversal of 21221122519 is 91522112212.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21221122519 is a prime.

It is a super-2 number, since 2×21221122519² (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 (21221122589) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610561259 + 10610561260.

It is an arithmetic number, because the mean of its divisors is an integer number (10610561260).

Almost surely, 2^21221122519 is an apocalyptic number.

21221122519 is a deficient number, since it is larger than the sum of its proper divisors (1).

21221122519 is an equidigital number, since it uses as much as digits as its factorization.

21221122519 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1440, while the sum is 28.

The spelling of 21221122519 in words is "twenty-one billion, two hundred twenty-one million, one hundred twenty-two thousand, five hundred nineteen".