21000020002112 has 14 divisors (see below), whose sum is σ = 41671914691818. Its totient is φ = 10500010001024.

The previous prime is 21000020002099. The next prime is 21000020002133. The reversal of 21000020002112 is 21120002000012.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 11514457743616 + 9485562258496 = 3393296^2 + 3079864^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21000020002093 and 21000020002102.

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, 164062656203 + ... + 164062656330.

Almost surely, 2^{21000020002112} is an apocalyptic number.

It is an amenable number.

21000020002112 is a deficient number, since it is larger than the sum of its proper divisors (20671894689706).

21000020002112 is an equidigital number, since it uses as much as digits as its factorization.

21000020002112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 328125312545 (or 328125312535 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 21000020002112 its reverse (21120002000012), we get a palindrome (42120022002124).

The spelling of 21000020002112 in words is "twenty-one trillion, twenty million, two thousand, one hundred twelve".