1221431220343 has 8 divisors (see below), whose sum is σ = 1227888128160. Its totient is φ = 1214991283200.

The previous prime is 1221431220341. The next prime is 1221431220349. The reversal of 1221431220343 is 3430221341221.

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 1221431220343 - 2¹ = 1221431220341 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 (1221431220341) 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, 4098330 + ... + 4386247.

It is an arithmetic number, because the mean of its divisors is an integer number (153486016020).

Almost surely, 2^{1221431220343} is an apocalyptic number.

1221431220343 is a deficient number, since it is larger than the sum of its proper divisors (6456907817).

1221431220343 is an equidigital number, since it uses as much as digits as its factorization.

1221431220343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8485337.

The product of its (nonzero) digits is 6912, while the sum is 28.

Adding to 1221431220343 its reverse (3430221341221), we get a palindrome (4651652561564).

The spelling of 1221431220343 in words is "one trillion, two hundred twenty-one billion, four hundred thirty-one million, two hundred twenty thousand, three hundred forty-three".