1221221022131 has 8 divisors (see below), whose sum is σ = 1339216201728. Its totient is φ = 1104388357000.

The previous prime is 1221221022107. The next prime is 1221221022157. The reversal of 1221221022131 is 1312201221221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1221221022131 - 2¹⁴ = 1221221005747 is a prime.

It is a super-2 number, since 2×1221221022131² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221221022101) 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 in 7 ways as a sum of consecutive naturals, for example, 290626415 + ... + 290630616.

It is an arithmetic number, because the mean of its divisors is an integer number (167402025216).

Almost surely, 2^{1221221022131} is an apocalyptic number.

1221221022131 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1221221022131 is a deficient number, since it is larger than the sum of its proper divisors (117995179597).

1221221022131 is a wasteful number, since it uses less digits than its factorization.

1221221022131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 581257233.

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 1221221022131 its reverse (1312201221221), we get a palindrome (2533422243352).

The spelling of 1221221022131 in words is "one trillion, two hundred twenty-one billion, two hundred twenty-one million, twenty-two thousand, one hundred thirty-one".