22121222012 has 6 divisors (see below), whose sum is σ = 38712138528. Its totient is φ = 11060611004.

The previous prime is 22121221981. The next prime is 22121222027. The reversal of 22121222012 is 21022212122.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2765152748 + ... + 2765152755.

It is an arithmetic number, because the mean of its divisors is an integer number (6452023088).

Almost surely, 2^22121222012 is an apocalyptic number.

It is an amenable number.

22121222012 is a deficient number, since it is larger than the sum of its proper divisors (16590916516).

22121222012 is a wasteful number, since it uses less digits than its factorization.

22121222012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5530305507 (or 5530305505 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 22121222012 its reverse (21022212122), we get a palindrome (43143434134).

The spelling of 22121222012 in words is "twenty-two billion, one hundred twenty-one million, two hundred twenty-two thousand, twelve".