21102021000203 has 48 divisors (see below), whose sum is σ = 24982801677216. Its totient is φ = 17668665630720.

The previous prime is 21102021000197. The next prime is 21102021000251. The reversal of 21102021000203 is 30200012020112.

It is a happy number.

It is not a de Polignac number, because 21102021000203 - 2¹⁰ = 21102020999179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21102021000253) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3171802025 + ... + 3171808677.

It is an arithmetic number, because the mean of its divisors is an integer number (520475034942).

Almost surely, 2^{21102021000203} is an apocalyptic number.

21102021000203 is a deficient number, since it is larger than the sum of its proper divisors (3880780677013).

21102021000203 is a wasteful number, since it uses less digits than its factorization.

21102021000203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10224 (or 10211 counting only the distinct ones).

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

Adding to 21102021000203 its reverse (30200012020112), we get a palindrome (51302033020315).

The spelling of 21102021000203 in words is "twenty-one trillion, one hundred two billion, twenty-one million, two hundred three", and thus it is an aban number.