210123020 has 24 divisors (see below), whose sum is σ = 442260000. Its totient is φ = 83858432.

The previous prime is 210123019. The next prime is 210123029. The reversal of 210123020 is 20321012.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 210122992 and 210123010.

It is not an unprimeable number, because it can be changed into a prime (210123029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2720 + ... + 20679.

It is an arithmetic number, because the mean of its divisors is an integer number (18427500).

Almost surely, 2^210123020 is an apocalyptic number.

210123020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

210123020 is an abundant number, since it is smaller than the sum of its proper divisors (232136980).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

210123020 is a wasteful number, since it uses less digits than its factorization.

210123020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23857 (or 23855 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 210123020 is about 14495.6207179962. The cubic root of 210123020 is about 594.5082394890.

Adding to 210123020 its reverse (20321012), we get a palindrome (230444032).

The spelling of 210123020 in words is "two hundred ten million, one hundred twenty-three thousand, twenty".