121222021871 has 2 divisors, whose sum is σ = 121222021872. Its totient is φ = 121222021870.

The previous prime is 121222021859. The next prime is 121222021981. The reversal of 121222021871 is 178120222121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121222021871 - 2¹⁸ = 121221759727 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121221021871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60611010935 + 60611010936.

It is an arithmetic number, because the mean of its divisors is an integer number (60611010936).

Almost surely, 2^121222021871 is an apocalyptic number.

121222021871 is a deficient number, since it is larger than the sum of its proper divisors (1).

121222021871 is an equidigital number, since it uses as much as digits as its factorization.

121222021871 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1792, while the sum is 29.

Adding to 121222021871 its reverse (178120222121), we get a palindrome (299342243992).

The spelling of 121222021871 in words is "one hundred twenty-one billion, two hundred twenty-two million, twenty-one thousand, eight hundred seventy-one".