21015112219 has 2 divisors, whose sum is σ = 21015112220. Its totient is φ = 21015112218.

The previous prime is 21015112163. The next prime is 21015112253. The reversal of 21015112219 is 91221151012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21015112219 - 2²³ = 21006723611 is a prime.

It is a super-2 number, since 2×21015112219² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21015112193 and 21015112202.

It is not a weakly prime, because it can be changed into another prime (21015112289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10507556109 + 10507556110.

It is an arithmetic number, because the mean of its divisors is an integer number (10507556110).

Almost surely, 2^21015112219 is an apocalyptic number.

21015112219 is a deficient number, since it is larger than the sum of its proper divisors (1).

21015112219 is an equidigital number, since it uses as much as digits as its factorization.

21015112219 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 360, while the sum is 25.

The spelling of 21015112219 in words is "twenty-one billion, fifteen million, one hundred twelve thousand, two hundred nineteen".