1221311320332 has 48 divisors (see below), whose sum is σ = 2897611782912. Its totient is φ = 400293754560.

The previous prime is 1221311320321. The next prime is 1221311320423. The reversal of 1221311320332 is 2330231131221.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1603738 + ... + 2239329.

It is an arithmetic number, because the mean of its divisors is an integer number (60366912144).

Almost surely, 2^{1221311320332} is an apocalyptic number.

1221311320332 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1221311320332 is an abundant number, since it is smaller than the sum of its proper divisors (1676300462580).

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

1221311320332 is a wasteful number, since it uses less digits than its factorization.

1221311320332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3843518 (or 3843516 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 24.

Adding to 1221311320332 its reverse (2330231131221), we get a palindrome (3551542451553).

The spelling of 1221311320332 in words is "one trillion, two hundred twenty-one billion, three hundred eleven million, three hundred twenty thousand, three hundred thirty-two".