21221100122 has 4 divisors (see below), whose sum is σ = 31831650186. Its totient is φ = 10610550060.

The previous prime is 21221100101. The next prime is 21221100149. The reversal of 21221100122 is 22100112212.

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., 19343524561 + 1877575561 = 139081^2 + 43331^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21221100097 and 21221100106.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5305275029 + ... + 5305275032.

Almost surely, 2^21221100122 is an apocalyptic number.

21221100122 is a deficient number, since it is larger than the sum of its proper divisors (10610550064).

21221100122 is a wasteful number, since it uses less digits than its factorization.

21221100122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10610550063.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21221100122 its reverse (22100112212), we get a palindrome (43321212334).

The spelling of 21221100122 in words is "twenty-one billion, two hundred twenty-one million, one hundred thousand, one hundred twenty-two".