22122121012 has 24 divisors (see below), whose sum is σ = 41112666504. Its totient is φ = 10379507712.

The previous prime is 22122121009. The next prime is 22122121067. The reversal of 22122121012 is 21012122122.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 4865620516 + 17256500496 = 69754^2 + 131364^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 459763 + ... + 505594.

It is an arithmetic number, because the mean of its divisors is an integer number (1713027771).

Almost surely, 2^22122121012 is an apocalyptic number.

It is an amenable number.

22122121012 is a deficient number, since it is larger than the sum of its proper divisors (18990545492).

22122121012 is a wasteful number, since it uses less digits than its factorization.

22122121012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 965715 (or 965713 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 22122121012 its reverse (21012122122), we get a palindrome (43134243134).

The spelling of 22122121012 in words is "twenty-two billion, one hundred twenty-two million, one hundred twenty-one thousand, twelve".