1221353430120 has 96 divisors (see below), whose sum is σ = 4178314389600. Its totient is φ = 308552443776.

The previous prime is 1221353430107. The next prime is 1221353430131. The reversal of 1221353430120 is 210343531221.

1221353430120 is a `hidden beast` number, since 1 + 2 + 2 + 1 + 3 + 534 + 3 + 0 + 120 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 89273382 + ... + 89287061.

It is an arithmetic number, because the mean of its divisors is an integer number (43524108225).

Almost surely, 2^{1221353430120} is an apocalyptic number.

1221353430120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221353430120 is an abundant number, since it is smaller than the sum of its proper divisors (2956960959480).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1221353430120 is a wasteful number, since it uses less digits than its factorization.

1221353430120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178560479 (or 178560472 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

Adding to 1221353430120 its reverse (210343531221), we get a palindrome (1431696961341).

The spelling of 1221353430120 in words is "one trillion, two hundred twenty-one billion, three hundred fifty-three million, four hundred thirty thousand, one hundred twenty".