21012111013203 has 12 divisors (see below), whose sum is σ = 30351812292568. Its totient is φ = 14007619267200.

The previous prime is 21012111013123. The next prime is 21012111013241. The reversal of 21012111013203 is 30231011121012.

21012111013203 is a `hidden beast` number, since 210 + 1 + 21 + 110 + 1 + 320 + 3 = 666.

It is not a de Polignac number, because 21012111013203 - 2⁹ = 21012111012691 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21012111013253) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 37602373 + ... + 38157078.

Almost surely, 2^{21012111013203} is an apocalyptic number.

21012111013203 is a deficient number, since it is larger than the sum of its proper divisors (9339701279365).

21012111013203 is a wasteful number, since it uses less digits than its factorization.

21012111013203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75790274 (or 75790271 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

Adding to 21012111013203 its reverse (30231011121012), we get a palindrome (51243122134215).

The spelling of 21012111013203 in words is "twenty-one trillion, twelve billion, one hundred eleven million, thirteen thousand, two hundred three".