21010230123 has 8 divisors (see below), whose sum is σ = 28042142208. Its totient is φ = 13992569064.

The previous prime is 21010230121. The next prime is 21010230169. The reversal of 21010230123 is 32103201012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21010230123 - 2¹ = 21010230121 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21010230121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3559315 + ... + 3565212.

It is an arithmetic number, because the mean of its divisors is an integer number (3505267776).

Almost surely, 2^21010230123 is an apocalyptic number.

21010230123 is a deficient number, since it is larger than the sum of its proper divisors (7031912085).

21010230123 is an equidigital number, since it uses as much as digits as its factorization.

21010230123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7125513.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 21010230123 its reverse (32103201012), we get a palindrome (53113431135).

The spelling of 21010230123 in words is "twenty-one billion, ten million, two hundred thirty thousand, one hundred twenty-three".