21085191219 has 8 divisors (see below), whose sum is σ = 28120961232. Its totient is φ = 14053107680.

The previous prime is 21085191191. The next prime is 21085191247. The reversal of 21085191219 is 91219158012.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21085191191) and next prime (21085191247).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21085191219 - 2⁷ = 21085191091 is a prime.

It is a super-2 number, since 2×21085191219² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21085111219) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 908244 + ... + 931169.

It is an arithmetic number, because the mean of its divisors is an integer number (3515120154).

Almost surely, 2^21085191219 is an apocalyptic number.

21085191219 is a deficient number, since it is larger than the sum of its proper divisors (7035770013).

21085191219 is a wasteful number, since it uses less digits than its factorization.

21085191219 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1843237.

The product of its (nonzero) digits is 12960, while the sum is 39.

The spelling of 21085191219 in words is "twenty-one billion, eighty-five million, one hundred ninety-one thousand, two hundred nineteen".