1221434253430 has 64 divisors (see below), whose sum is σ = 2254511232000. Its totient is φ = 476270720640.

The previous prime is 1221434253421. The next prime is 1221434253437. The reversal of 1221434253430 is 343524341221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221434253437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 77934495 + ... + 77950165.

It is an arithmetic number, because the mean of its divisors is an integer number (35226738000).

Almost surely, 2^{1221434253430} is an apocalyptic number.

1221434253430 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221434253430 is a deficient number, since it is larger than the sum of its proper divisors (1033076978570).

1221434253430 is a wasteful number, since it uses less digits than its factorization.

1221434253430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16669.

The product of its (nonzero) digits is 69120, while the sum is 34.

Adding to 1221434253430 its reverse (343524341221), we get a palindrome (1564958594651).

The spelling of 1221434253430 in words is "one trillion, two hundred twenty-one billion, four hundred thirty-four million, two hundred fifty-three thousand, four hundred thirty".