21003022112 has 48 divisors (see below), whose sum is σ = 42401970072. Its totient is φ = 10234798080.

The previous prime is 21003022069. The next prime is 21003022121. The reversal of 21003022112 is 21122030012.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 20896437136 + 106584976 = 144556^2 + 10324^2 .

It is a super-2 number, since 2×21003022112² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1347548 + ... + 1363044.

Almost surely, 2^21003022112 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21003022112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21200985036).

21003022112 is an abundant number, since it is smaller than the sum of its proper divisors (21398947960).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21003022112 is a wasteful number, since it uses less digits than its factorization.

21003022112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16581 (or 16573 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 21003022112 its reverse (21122030012), we get a palindrome (42125052124).

The spelling of 21003022112 in words is "twenty-one billion, three million, twenty-two thousand, one hundred twelve".