1221020002231 has 2 divisors, whose sum is σ = 1221020002232. Its totient is φ = 1221020002230.

The previous prime is 1221020002211. The next prime is 1221020002243. The reversal of 1221020002231 is 1322000201221.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1221020002231 - 2¹³ = 1221019994039 is a prime.

It is a super-2 number, since 2×1221020002231² (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 (1221020002211) 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, 610510001115 + 610510001116.

It is an arithmetic number, because the mean of its divisors is an integer number (610510001116).

Almost surely, 2^{1221020002231} is an apocalyptic number.

1221020002231 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221020002231 is an equidigital number, since it uses as much as digits as its factorization.

1221020002231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 1221020002231 its reverse (1322000201221), we get a palindrome (2543020203452).

The spelling of 1221020002231 in words is "one trillion, two hundred twenty-one billion, twenty million, two thousand, two hundred thirty-one".