21022010123 has 4 divisors (see below), whose sum is σ = 21022332960. Its totient is φ = 21021687288.

The previous prime is 21022010111. The next prime is 21022010171. The reversal of 21022010123 is 32101022012.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21022010123 - 2²⁴ = 21005232907 is a prime.

It is a super-2 number, since 2×21022010123² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21022010098 and 21022010107.

It is not an unprimeable number, because it can be changed into a prime (21022010183) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25715 + ... + 206652.

It is an arithmetic number, because the mean of its divisors is an integer number (5255583240).

Almost surely, 2^21022010123 is an apocalyptic number.

21022010123 is a deficient number, since it is larger than the sum of its proper divisors (322837).

21022010123 is an equidigital number, since it uses as much as digits as its factorization.

21022010123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322836.

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

Adding to 21022010123 its reverse (32101022012), we get a palindrome (53123032135).

The spelling of 21022010123 in words is "twenty-one billion, twenty-two million, ten thousand, one hundred twenty-three".