121223305531 has 2 divisors, whose sum is σ = 121223305532. Its totient is φ = 121223305530.

The previous prime is 121223305481. The next prime is 121223305547. The reversal of 121223305531 is 135503322121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 121223305531 - 2¹⁵ = 121223272763 is a prime.

It is a super-2 number, since 2×121223305531² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 121223305531.

It is not a weakly prime, because it can be changed into another prime (121223305331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60611652765 + 60611652766.

It is an arithmetic number, because the mean of its divisors is an integer number (60611652766).

Almost surely, 2^121223305531 is an apocalyptic number.

121223305531 is a deficient number, since it is larger than the sum of its proper divisors (1).

121223305531 is an equidigital number, since it uses as much as digits as its factorization.

121223305531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5400, while the sum is 28.

Adding to 121223305531 its reverse (135503322121), we get a palindrome (256726627652).

The spelling of 121223305531 in words is "one hundred twenty-one billion, two hundred twenty-three million, three hundred five thousand, five hundred thirty-one".