22161019391 has 8 divisors (see below), whose sum is σ = 25333002240. Its totient is φ = 18990567288.

The previous prime is 22161019357. The next prime is 22161019399. The reversal of 22161019391 is 19391016122.

It is a happy number.

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

It is not a de Polignac number, because 22161019391 - 2¹⁰ = 22161018367 is a prime.

It is a super-2 number, since 2×22161019391² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22161019399) 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, 351491 + ... + 409716.

It is an arithmetic number, because the mean of its divisors is an integer number (3166625280).

Almost surely, 2^22161019391 is an apocalyptic number.

22161019391 is a deficient number, since it is larger than the sum of its proper divisors (3171982849).

22161019391 is an equidigital number, since it uses as much as digits as its factorization.

22161019391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 765373.

The product of its (nonzero) digits is 5832, while the sum is 35.

The spelling of 22161019391 in words is "twenty-two billion, one hundred sixty-one million, nineteen thousand, three hundred ninety-one".