21276121222 has 4 divisors (see below), whose sum is σ = 31914181836. Its totient is φ = 10638060610.

The previous prime is 21276121219. The next prime is 21276121241. The reversal of 21276121222 is 22212167212.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 5319030304 + ... + 5319030307.

It is an arithmetic number, because the mean of its divisors is an integer number (7978545459).

Almost surely, 2^21276121222 is an apocalyptic number.

21276121222 is a deficient number, since it is larger than the sum of its proper divisors (10638060614).

21276121222 is a wasteful number, since it uses less digits than its factorization.

21276121222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10638060613.

The product of its digits is 2688, while the sum is 28.

Adding to 21276121222 its reverse (22212167212), we get a palindrome (43488288434).

The spelling of 21276121222 in words is "twenty-one billion, two hundred seventy-six million, one hundred twenty-one thousand, two hundred twenty-two".