10000021123 has 4 divisors (see below), whose sum is σ = 10000362568. Its totient is φ = 9999679680.

The previous prime is 10000021111. The next prime is 10000021139. The reversal of 10000021123 is 32112000001.

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 10000021123 - 2¹⁷ = 9999890051 is a prime.

It is a super-2 number, since 2×10000021123² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10000021103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 122193 + ... + 186898.

It is an arithmetic number, because the mean of its divisors is an integer number (2500090642).

Almost surely, 2^10000021123 is an apocalyptic number.

10000021123 is a deficient number, since it is larger than the sum of its proper divisors (341445).

10000021123 is an equidigital number, since it uses as much as digits as its factorization.

10000021123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 341444.

The product of its (nonzero) digits is 12, while the sum is 10.

Adding to 10000021123 its reverse (32112000001), we get a palindrome (42112021124).

The spelling of 10000021123 in words is "ten billion, twenty-one thousand, one hundred twenty-three".