1221002012231 has 4 divisors (see below), whose sum is σ = 1226068410864. Its totient is φ = 1215935613600.

The previous prime is 1221002012201. The next prime is 1221002012281. The reversal of 1221002012231 is 1322102001221.

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 1221002012231 - 2¹⁴ = 1221001995847 is a prime.

It is a super-2 number, since 2×1221002012231² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221002012201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2533198955 + ... + 2533199436.

It is an arithmetic number, because the mean of its divisors is an integer number (306517102716).

Almost surely, 2^{1221002012231} is an apocalyptic number.

1221002012231 is a deficient number, since it is larger than the sum of its proper divisors (5066398633).

1221002012231 is an equidigital number, since it uses as much as digits as its factorization.

1221002012231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5066398632.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 1221002012231 its reverse (1322102001221), we get a palindrome (2543104013452).

The spelling of 1221002012231 in words is "one trillion, two hundred twenty-one billion, two million, twelve thousand, two hundred thirty-one".