21311020219 has 2 divisors, whose sum is σ = 21311020220. Its totient is φ = 21311020218.

The previous prime is 21311020189. The next prime is 21311020229. The reversal of 21311020219 is 91202011312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21311020219 - 2²⁵ = 21277465787 is a prime.

It is a super-2 number, since 2×21311020219² (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 21311020219.

It is not a weakly prime, because it can be changed into another prime (21311020229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10655510109 + 10655510110.

It is an arithmetic number, because the mean of its divisors is an integer number (10655510110).

Almost surely, 2^21311020219 is an apocalyptic number.

21311020219 is a deficient number, since it is larger than the sum of its proper divisors (1).

21311020219 is an equidigital number, since it uses as much as digits as its factorization.

21311020219 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 22.

The spelling of 21311020219 in words is "twenty-one billion, three hundred eleven million, twenty thousand, two hundred nineteen".