210001023 has 12 divisors (see below), whose sum is σ = 306463248. Its totient is φ = 138556800.

The previous prime is 210001021. The next prime is 210001069. The reversal of 210001023 is 320100012.

It is a happy number.

It is not a de Polignac number, because 210001023 - 2¹ = 210001021 is a prime.

It is a super-2 number, since 2×210001023² = 88200859322093058, which contains 22 as substring.

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

It is a junction number, because it is equal to n+sod(n) for n = 210000996 and 210001014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210001021) 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, 119403 + ... + 121148.

It is an arithmetic number, because the mean of its divisors is an integer number (25538604).

Almost surely, 2^210001023 is an apocalyptic number.

210001023 is a deficient number, since it is larger than the sum of its proper divisors (96462225).

210001023 is a wasteful number, since it uses less digits than its factorization.

210001023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240654 (or 240651 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

The square root of 210001023 is about 14491.4120429998. The cubic root of 210001023 is about 594.3931604545.

Adding to 210001023 its reverse (320100012), we get a palindrome (530101035).

The spelling of 210001023 in words is "two hundred ten million, one thousand, twenty-three".