21000221122 has 4 divisors (see below), whose sum is σ = 31500331686. Its totient is φ = 10500110560.

The previous prime is 21000221119. The next prime is 21000221131. The reversal of 21000221122 is 22112200012.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 10859932521 + 10140288601 = 104211^2 + 100699^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5250055279 + ... + 5250055282.

Almost surely, 2^21000221122 is an apocalyptic number.

21000221122 is a deficient number, since it is larger than the sum of its proper divisors (10500110564).

21000221122 is a wasteful number, since it uses less digits than its factorization.

21000221122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10500110563.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21000221122 its reverse (22112200012), we get a palindrome (43112421134).

The spelling of 21000221122 in words is "twenty-one billion, two hundred twenty-one thousand, one hundred twenty-two".