1213202042021 has 16 divisors (see below), whose sum is σ = 1224805248576. Its totient is φ = 1201662000000.

The previous prime is 1213202042009. The next prime is 1213202042047. The reversal of 1213202042021 is 1202402023121.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1213202042021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1213202041984 and 1213202042002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213202047021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 69952811 + ... + 69970151.

It is an arithmetic number, because the mean of its divisors is an integer number (76550328036).

Almost surely, 2^{1213202042021} is an apocalyptic number.

It is an amenable number.

1213202042021 is a deficient number, since it is larger than the sum of its proper divisors (11603206555).

1213202042021 is a wasteful number, since it uses less digits than its factorization.

1213202042021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19124.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 1213202042021 its reverse (1202402023121), we get a palindrome (2415604065142).

The spelling of 1213202042021 in words is "one trillion, two hundred thirteen billion, two hundred two million, forty-two thousand, twenty-one".