21091120922 has 8 divisors (see below), whose sum is σ = 31659138900. Its totient is φ = 10538074624.

The previous prime is 21091120901. The next prime is 21091120927. The reversal of 21091120922 is 22902119012.

It can be written as a sum of positive squares in 2 ways, for example, as 19723674481 + 1367446441 = 140441^2 + 36979^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21091120922² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21091120927) 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 3 ways as a sum of consecutive naturals, for example, 3739397 + ... + 3745032.

Almost surely, 2^21091120922 is an apocalyptic number.

21091120922 is a deficient number, since it is larger than the sum of its proper divisors (10568017978).

21091120922 is a wasteful number, since it uses less digits than its factorization.

21091120922 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7485840.

The product of its (nonzero) digits is 1296, while the sum is 29.

Adding to 21091120922 its reverse (22902119012), we get a palindrome (43993239934).

The spelling of 21091120922 in words is "twenty-one billion, ninety-one million, one hundred twenty thousand, nine hundred twenty-two".