1221553332430 has 64 divisors (see below), whose sum is σ = 2275549562880. Its totient is φ = 471896118144.

The previous prime is 1221553332427. The next prime is 1221553332457. The reversal of 1221553332430 is 342333551221.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14703267 + ... + 14786113.

It is an arithmetic number, because the mean of its divisors is an integer number (35555461920).

Almost surely, 2^{1221553332430} is an apocalyptic number.

1221553332430 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221553332430 is a deficient number, since it is larger than the sum of its proper divisors (1053996230450).

1221553332430 is a wasteful number, since it uses less digits than its factorization.

1221553332430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83353.

The product of its (nonzero) digits is 64800, while the sum is 34.

Adding to 1221553332430 its reverse (342333551221), we get a palindrome (1563886883651).

The spelling of 1221553332430 in words is "one trillion, two hundred twenty-one billion, five hundred fifty-three million, three hundred thirty-two thousand, four hundred thirty".