12001211210021 has 16 divisors (see below), whose sum is σ = 13113258359040. Its totient is φ = 10892671225920.

The previous prime is 12001211209987. The next prime is 12001211210041.

12001211210021 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 12001211210021 - 2¹⁰ = 12001211208997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12001211209978 and 12001211210005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12001211210041) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 109622516 + ... + 109731938.

It is an arithmetic number, because the mean of its divisors is an integer number (819578647440).

Almost surely, 2^{12001211210021} is an apocalyptic number.

12001211210021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12001211210021 is a deficient number, since it is larger than the sum of its proper divisors (1112047149019).

12001211210021 is a wasteful number, since it uses less digits than its factorization.

12001211210021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125356.

The product of its (nonzero) digits is 16, while the sum is 14.

It can be divided in two parts, 1200121 and 1210021, that added together give a palindrome (2410142).

The spelling of 12001211210021 in words is "twelve trillion, one billion, two hundred eleven million, two hundred ten thousand, twenty-one".