12012020002021 has 16 divisors (see below), whose sum is σ = 12981119744880. Its totient is φ = 11049368394240.

The previous prime is 12012020002019. The next prime is 12012020002049. The reversal of 12012020002021 is 12020002021021.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 3031725204225 + 8980294797796 = 1741185^2 + 2996714^2 .

It is a cyclic number.

It is not a de Polignac number, because 12012020002021 - 2¹ = 12012020002019 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 = 12012020001992 and 12012020002010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12012020002061) 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, 55583545 + ... + 55799233.

It is an arithmetic number, because the mean of its divisors is an integer number (811319984055).

Almost surely, 2^{12012020002021} is an apocalyptic number.

It is an amenable number.

12012020002021 is a deficient number, since it is larger than the sum of its proper divisors (969099742859).

12012020002021 is a wasteful number, since it uses less digits than its factorization.

12012020002021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230616.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 12012020002021 its reverse (12020002021021), we get a palindrome (24032022023042).

The spelling of 12012020002021 in words is "twelve trillion, twelve billion, twenty million, two thousand, twenty-one".