21220002112 has 14 divisors (see below), whose sum is σ = 42108441818. Its totient is φ = 10610001024.

The previous prime is 21220002073. The next prime is 21220002113. The reversal of 21220002112 is 21120002212.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 19214395456 + 2005606656 = 138616^2 + 44784^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21220002092 and 21220002101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220002113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165781203 + ... + 165781330.

Almost surely, 2^21220002112 is an apocalyptic number.

It is an amenable number.

21220002112 is a deficient number, since it is larger than the sum of its proper divisors (20888439706).

21220002112 is an equidigital number, since it uses as much as digits as its factorization.

21220002112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 331562545 (or 331562535 counting only the distinct ones).

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

Adding to 21220002112 its reverse (21120002212), we get a palindrome (42340004324).

The spelling of 21220002112 in words is "twenty-one billion, two hundred twenty million, two thousand, one hundred twelve".