21002020002112 has 14 divisors (see below), whose sum is σ = 41675883441818. Its totient is φ = 10501010001024.

The previous prime is 21002020002109. The next prime is 21002020002133. The reversal of 21002020002112 is 21120002020012.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 18515671304256 + 2486348697856 = 4302984^2 + 1576816^2 .

It is a super-2 number, since 2×21002020002112² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21002020002092 and 21002020002101.

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, 164078281203 + ... + 164078281330.

Almost surely, 2^{21002020002112} is an apocalyptic number.

It is an amenable number.

21002020002112 is a deficient number, since it is larger than the sum of its proper divisors (20673863439706).

21002020002112 is an equidigital number, since it uses as much as digits as its factorization.

21002020002112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 328156562545 (or 328156562535 counting only the distinct ones).

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

Adding to 21002020002112 its reverse (21120002020012), we get a palindrome (42122022022124).

The spelling of 21002020002112 in words is "twenty-one trillion, two billion, twenty million, two thousand, one hundred twelve".