21220012122919 has 2 divisors, whose sum is σ = 21220012122920. Its totient is φ = 21220012122918.

The previous prime is 21220012122901. The next prime is 21220012122923. The reversal of 21220012122919 is 91922121002212.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21220012122919 - 2¹³ = 21220012114727 is a prime.

It is a super-2 number, since 2×21220012122919² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21220012122019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610006061459 + 10610006061460.

It is an arithmetic number, because the mean of its divisors is an integer number (10610006061460).

Almost surely, 2^{21220012122919} is an apocalyptic number.

21220012122919 is a deficient number, since it is larger than the sum of its proper divisors (1).

21220012122919 is an equidigital number, since it uses as much as digits as its factorization.

21220012122919 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 34.

The spelling of 21220012122919 in words is "twenty-one trillion, two hundred twenty billion, twelve million, one hundred twenty-two thousand, nine hundred nineteen".