210000110100021 has 12 divisors (see below), whose sum is σ = 303562078286272. Its totient is φ = 139894572206376.

The previous prime is 210000110100019. The next prime is 210000110100049. The reversal of 210000110100021 is 120001011000012.

It is a happy number.

It is not a de Polignac number, because 210000110100021 - 2¹ = 210000110100019 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210000110099976 and 210000110100012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210000110100721) 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, 8791753531 + ... + 8791777416.

Almost surely, 2^{210000110100021} is an apocalyptic number.

It is an amenable number.

210000110100021 is a deficient number, since it is larger than the sum of its proper divisors (93561968186251).

210000110100021 is a wasteful number, since it uses less digits than its factorization.

210000110100021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17583532280 (or 17583532277 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 210000110100021 its reverse (120001011000012), we get a palindrome (330001121100033).

The spelling of 210000110100021 in words is "two hundred ten trillion, one hundred ten million, one hundred thousand, twenty-one".