1232020421 has 4 divisors (see below), whose sum is σ = 1232095500. Its totient is φ = 1231945344.

The previous prime is 1232020411. The next prime is 1232020423. The reversal of 1232020421 is 1240202321.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1240202321 = 11447 ⋅108343.

It can be written as a sum of positive squares in 2 ways, for example, as 448804225 + 783216196 = 21185^2 + 27986^2 .

It is a cyclic number.

It is not a de Polignac number, because 1232020421 - 2³⁰ = 158278597 is a prime.

It is a super-2 number, since 2×1232020421² = 3035748635522034482, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1232020421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1232020423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1196 + ... + 49653.

It is an arithmetic number, because the mean of its divisors is an integer number (308023875).

Almost surely, 2^1232020421 is an apocalyptic number.

It is an amenable number.

1232020421 is a deficient number, since it is larger than the sum of its proper divisors (75079).

1232020421 is an equidigital number, since it uses as much as digits as its factorization.

1232020421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75078.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 1232020421 is about 35100.1484469795. The cubic root of 1232020421 is about 1072.0276052542.

Adding to 1232020421 its reverse (1240202321), we get a palindrome (2472222742).

The spelling of 1232020421 in words is "one billion, two hundred thirty-two million, twenty thousand, four hundred twenty-one".