1220431140421 has 8 divisors (see below), whose sum is σ = 1250361010584. Its totient is φ = 1190509044480.

The previous prime is 1220431140319. The next prime is 1220431140437. The reversal of 1220431140421 is 1240411340221.

It can be written as a sum of positive squares in 4 ways, for example, as 10620333025 + 1209810807396 = 103055^2 + 1099914^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1220431140421 - 2⁹ = 1220431139909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220431141421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1625106 + ... + 2254291.

It is an arithmetic number, because the mean of its divisors is an integer number (156295126323).

Almost surely, 2^{1220431140421} is an apocalyptic number.

It is an amenable number.

1220431140421 is a deficient number, since it is larger than the sum of its proper divisors (29929870163).

1220431140421 is an equidigital number, since it uses as much as digits as its factorization.

1220431140421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3887111.

The product of its (nonzero) digits is 1536, while the sum is 25.

Adding to 1220431140421 its reverse (1240411340221), we get a palindrome (2460842480642).

The spelling of 1220431140421 in words is "one trillion, two hundred twenty billion, four hundred thirty-one million, one hundred forty thousand, four hundred twenty-one".