1221221313230 has 16 divisors (see below), whose sum is σ = 2198275316640. Its totient is φ = 488471424672.

The previous prime is 1221221313197. The next prime is 1221221313239. The reversal of 1221221313230 is 323131221221.

It is a junction number, because it is equal to n+sod(n) for n = 1221221313196 and 1221221313205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221221313239) 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, 1835609 + ... + 2410788.

It is an arithmetic number, because the mean of its divisors is an integer number (137392207290).

Almost surely, 2^{1221221313230} is an apocalyptic number.

1221221313230 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221221313230 is a deficient number, since it is larger than the sum of its proper divisors (977054003410).

1221221313230 is a wasteful number, since it uses less digits than its factorization.

1221221313230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4275163.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 1221221313230 its reverse (323131221221), we get a palindrome (1544352534451).

The spelling of 1221221313230 in words is "one trillion, two hundred twenty-one billion, two hundred twenty-one million, three hundred thirteen thousand, two hundred thirty".