1232021220021 has 6 divisors (see below), whose sum is σ = 1779586206710. Its totient is φ = 821347480008.

The previous prime is 1232021220019. The next prime is 1232021220029. The reversal of 1232021220021 is 1200221202321.

1232021220021 is a `hidden beast` number, since 1 + 232 + 0 + 212 + 200 + 21 = 666.

It can be written as a sum of positive squares in only one way, i.e., 733463780625 + 498557439396 = 856425^2 + 706086^2 .

It is not a de Polignac number, because 1232021220021 - 2¹ = 1232021220019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1232021219976 and 1232021220003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1232021220029) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 68445623326 + ... + 68445623343.

Almost surely, 2^{1232021220021} is an apocalyptic number.

It is an amenable number.

1232021220021 is a deficient number, since it is larger than the sum of its proper divisors (547564986689).

1232021220021 is a wasteful number, since it uses less digits than its factorization.

1232021220021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136891246675 (or 136891246672 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 1232021220021 its reverse (1200221202321), we get a palindrome (2432242422342).

The spelling of 1232021220021 in words is "one trillion, two hundred thirty-two billion, twenty-one million, two hundred twenty thousand, twenty-one".