121722143 has 2 divisors, whose sum is σ = 121722144. Its totient is φ = 121722142.

The previous prime is 121722137. The next prime is 121722197. The reversal of 121722143 is 341227121.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121722143 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121722103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60861071 + 60861072.

It is an arithmetic number, because the mean of its divisors is an integer number (60861072).

Almost surely, 2^121722143 is an apocalyptic number.

121722143 is a deficient number, since it is larger than the sum of its proper divisors (1).

121722143 is an equidigital number, since it uses as much as digits as its factorization.

121722143 is an evil number, because the sum of its binary digits is even.

The product of its digits is 672, while the sum is 23.

The square root of 121722143 is about 11032.7758519785. The cubic root of 121722143 is about 495.5907554205.

Adding to 121722143 its reverse (341227121), we get a palindrome (462949264).

The spelling of 121722143 in words is "one hundred twenty-one million, seven hundred twenty-two thousand, one hundred forty-three".