1221221032331 has 4 divisors (see below), whose sum is σ = 1233077547312. Its totient is φ = 1209364517352.

The previous prime is 1221221032327. The next prime is 1221221032429. The reversal of 1221221032331 is 1332301221221.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1221221032331 - 2² = 1221221032327 is a prime.

It is a super-2 number, since 2×1221221032331² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1221221032297 and 1221221032306.

It is not an unprimeable number, because it can be changed into a prime (1221221032631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5928257336 + ... + 5928257541.

It is an arithmetic number, because the mean of its divisors is an integer number (308269386828).

Almost surely, 2^{1221221032331} is an apocalyptic number.

1221221032331 is a deficient number, since it is larger than the sum of its proper divisors (11856514981).

1221221032331 is a wasteful number, since it uses less digits than its factorization.

1221221032331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11856514980.

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

Adding to 1221221032331 its reverse (1332301221221), we get a palindrome (2553522253552).

The spelling of 1221221032331 in words is "one trillion, two hundred twenty-one billion, two hundred twenty-one million, thirty-two thousand, three hundred thirty-one".