22121661242 has 16 divisors (see below), whose sum is σ = 33308799720. Its totient is φ = 11018771712.

The previous prime is 22121661241. The next prime is 22121661307. The reversal of 22121661242 is 24216612122.

It can be written as a sum of positive squares in 4 ways, for example, as 15406022641 + 6715638601 = 124121^2 + 81949^2 .

It is a super-2 number, since 2×22121661242² (a number of 21 digits) contains 22 as substring.

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

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1110038 + ... + 1129790.

Almost surely, 2^22121661242 is an apocalyptic number.

22121661242 is a deficient number, since it is larger than the sum of its proper divisors (11187138478).

22121661242 is a wasteful number, since it uses less digits than its factorization.

22121661242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21857.

The product of its digits is 4608, while the sum is 29.

The spelling of 22121661242 in words is "twenty-two billion, one hundred twenty-one million, six hundred sixty-one thousand, two hundred forty-two".