21220032112 has 10 divisors (see below), whose sum is σ = 41113812248. Its totient is φ = 10610016048.

The previous prime is 21220032101. The next prime is 21220032133. The reversal of 21220032112 is 21123002212.

It is a happy number.

It is a super-2 number, since 2×21220032112² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (16), and also a Moran number because the ratio is a prime number: 1326252007 = 21220032112 / (2 + 1 + 2 + 2 + 0 + 0 + 3 + 2 + 1 + 1 + 2).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 663125988 + ... + 663126019.

Almost surely, 2^21220032112 is an apocalyptic number.

It is an amenable number.

21220032112 is a deficient number, since it is larger than the sum of its proper divisors (19893780136).

21220032112 is a wasteful number, since it uses less digits than its factorization.

21220032112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1326252015 (or 1326252009 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21220032112 its reverse (21123002212), we get a palindrome (42343034324).

The spelling of 21220032112 in words is "twenty-one billion, two hundred twenty million, thirty-two thousand, one hundred twelve".