1221245343 has 12 divisors (see below), whose sum is σ = 1829355528. Its totient is φ = 814163400.

The previous prime is 1221245339. The next prime is 1221245357. The reversal of 1221245343 is 3435421221.

1221245343 is a `hidden beast` number, since 1 + 2 + 2 + 124 + 534 + 3 = 666.

It is not a de Polignac number, because 1221245343 - 2² = 1221245339 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221245143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2512608 + ... + 2513093.

It is an arithmetic number, because the mean of its divisors is an integer number (152446294).

Almost surely, 2^1221245343 is an apocalyptic number.

1221245343 is a deficient number, since it is larger than the sum of its proper divisors (608110185).

1221245343 is an frugal number, since it uses more digits than its factorization.

1221245343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5025716 (or 5025704 counting only the distinct ones).

The product of its digits is 5760, while the sum is 27.

The square root of 1221245343 is about 34946.3208793143. The cubic root of 1221245343 is about 1068.8931819249.

Adding to 1221245343 its reverse (3435421221), we get a palindrome (4656666564).

The spelling of 1221245343 in words is "one billion, two hundred twenty-one million, two hundred forty-five thousand, three hundred forty-three".