1213013220021 has 12 divisors (see below), whose sum is σ = 1752228526048. Its totient is φ = 808630101864.

The previous prime is 1213013220017. The next prime is 1213013220043. The reversal of 1213013220021 is 1200223103121.

1213013220021 is a `hidden beast` number, since 1 + 21 + 301 + 322 + 0 + 0 + 21 = 666.

It is not a de Polignac number, because 1213013220021 - 2² = 1213013220017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1213013219976 and 1213013220003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213013220091) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3611815 + ... + 3933348.

Almost surely, 2^{1213013220021} is an apocalyptic number.

It is an amenable number.

1213013220021 is a deficient number, since it is larger than the sum of its proper divisors (539215306027).

1213013220021 is a wasteful number, since it uses less digits than its factorization.

1213013220021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7563032 (or 7563029 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 1213013220021 its reverse (1200223103121), we get a palindrome (2413236323142).

The spelling of 1213013220021 in words is "one trillion, two hundred thirteen billion, thirteen million, two hundred twenty thousand, twenty-one".