1221000331301 has 4 divisors (see below), whose sum is σ = 1223820193932. Its totient is φ = 1218180468672.

The previous prime is 1221000331277. The next prime is 1221000331303. The reversal of 1221000331301 is 1031330001221.

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

It can be written as a sum of positive squares in 2 ways, for example, as 214642257025 + 1006358074276 = 463295^2 + 1003174^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1221000331301 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1221000331301.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221000331303) 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, 1409930666 + ... + 1409931531.

It is an arithmetic number, because the mean of its divisors is an integer number (305955048483).

Almost surely, 2^{1221000331301} is an apocalyptic number.

It is an amenable number.

1221000331301 is a deficient number, since it is larger than the sum of its proper divisors (2819862631).

1221000331301 is an equidigital number, since it uses as much as digits as its factorization.

1221000331301 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2819862630.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 1221000331301 its reverse (1031330001221), we get a palindrome (2252330332522).

The spelling of 1221000331301 in words is "one trillion, two hundred twenty-one billion, three hundred thirty-one thousand, three hundred one".