2221321291690 has 24 divisors (see below), whose sum is σ = 4098278349900. Its totient is φ = 866857082880.

The previous prime is 2221321291687. The next prime is 2221321291691. The reversal of 2221321291690 is 961921231222.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 31208402281 + 2190112889409 = 176659^2 + 1479903^2 .

It is a super-2 number, since 2×2221321291690² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2221321291691) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 66054615 + ... + 66088234.

Almost surely, 2^{2221321291690} is an apocalyptic number.

2221321291690 is a deficient number, since it is larger than the sum of its proper divisors (1876957058210).

2221321291690 is a wasteful number, since it uses less digits than its factorization.

2221321291690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132142938 (or 132142897 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 40.

The spelling of 2221321291690 in words is "two trillion, two hundred twenty-one billion, three hundred twenty-one million, two hundred ninety-one thousand, six hundred ninety".