12001210021021 has 16 divisors (see below), whose sum is σ = 13182138054400. Its totient is φ = 10859122243008.

The previous prime is 12001210021013. The next prime is 12001210021037. The reversal of 12001210021021 is 12012001210021.

It is not a de Polignac number, because 12001210021021 - 2³ = 12001210021013 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12001210020992 and 12001210021010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12001210021051) 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, 41892126 + ... + 42177631.

It is an arithmetic number, because the mean of its divisors is an integer number (823883628400).

Almost surely, 2^{12001210021021} is an apocalyptic number.

It is an amenable number.

12001210021021 is a deficient number, since it is larger than the sum of its proper divisors (1180928033379).

12001210021021 is a wasteful number, since it uses less digits than its factorization.

12001210021021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84069988.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 12001210021021 its reverse (12012001210021), we get a palindrome (24013211231042).

The spelling of 12001210021021 in words is "twelve trillion, one billion, two hundred ten million, twenty-one thousand, twenty-one".