21010012012123 has 8 divisors (see below), whose sum is σ = 21014172927216. Its totient is φ = 21005851440000.

The previous prime is 21010012012117. The next prime is 21010012012133. The reversal of 21010012012123 is 32121021001012.

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

It is a cyclic number.

It is not a de Polignac number, because 21010012012123 - 2⁵ = 21010012012091 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21010012012097 and 21010012012106.

It is not an unprimeable number, because it can be changed into a prime (21010012012133) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 146326215 + ... + 146469727.

It is an arithmetic number, because the mean of its divisors is an integer number (2626771615902).

Almost surely, 2^{21010012012123} is an apocalyptic number.

21010012012123 is a deficient number, since it is larger than the sum of its proper divisors (4160915093).

21010012012123 is a wasteful number, since it uses less digits than its factorization.

21010012012123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171485.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 21010012012123 its reverse (32121021001012), we get a palindrome (53131033013135).

The spelling of 21010012012123 in words is "twenty-one trillion, ten billion, twelve million, twelve thousand, one hundred twenty-three".