1221011002231 has 2 divisors, whose sum is σ = 1221011002232. Its totient is φ = 1221011002230.

The previous prime is 1221011002219. The next prime is 1221011002271. The reversal of 1221011002231 is 1322001101221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1221011002231 - 2⁵ = 1221011002199 is a prime.

It is a super-2 number, since 2×1221011002231² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221011002201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610505501115 + 610505501116.

It is an arithmetic number, because the mean of its divisors is an integer number (610505501116).

Almost surely, 2^{1221011002231} is an apocalyptic number.

1221011002231 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221011002231 is an equidigital number, since it uses as much as digits as its factorization.

1221011002231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 1221011002231 its reverse (1322001101221), we get a palindrome (2543012103452).

The spelling of 1221011002231 in words is "one trillion, two hundred twenty-one billion, eleven million, two thousand, two hundred thirty-one".