22121661243 has 16 divisors (see below), whose sum is σ = 32430329856. Its totient is φ = 13301497440.

The previous prime is 22121661241. The next prime is 22121661307. The reversal of 22121661243 is 34216612122.

It is not a de Polignac number, because 22121661243 - 2¹ = 22121661241 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 22121661243.

It is not an unprimeable number, because it can be changed into a prime (22121661241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2634996 + ... + 2643377.

It is an arithmetic number, because the mean of its divisors is an integer number (2026895616).

Almost surely, 2^22121661243 is an apocalyptic number.

22121661243 is a deficient number, since it is larger than the sum of its proper divisors (10308668613).

22121661243 is a wasteful number, since it uses less digits than its factorization.

22121661243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5278514.

The product of its digits is 6912, while the sum is 30.

The spelling of 22121661243 in words is "twenty-two billion, one hundred twenty-one million, six hundred sixty-one thousand, two hundred forty-three".