21122020219 has 2 divisors, whose sum is σ = 21122020220. Its totient is φ = 21122020218.

The previous prime is 21122020189. The next prime is 21122020223. The reversal of 21122020219 is 91202022112.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21122020219 is a prime.

It is a super-2 number, since 2×21122020219² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21122020219.

It is not a weakly prime, because it can be changed into another prime (21122020919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10561010109 + 10561010110.

It is an arithmetic number, because the mean of its divisors is an integer number (10561010110).

Almost surely, 2^21122020219 is an apocalyptic number.

21122020219 is a deficient number, since it is larger than the sum of its proper divisors (1).

21122020219 is an equidigital number, since it uses as much as digits as its factorization.

21122020219 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 22.

The spelling of 21122020219 in words is "twenty-one billion, one hundred twenty-two million, twenty thousand, two hundred nineteen".