1221724142143 has 8 divisors (see below), whose sum is σ = 1223461628928. Its totient is φ = 1219987763064.

The previous prime is 1221724142137. The next prime is 1221724142173. The reversal of 1221724142143 is 3412414271221.

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 1221724142143 - 2²⁹ = 1221187271231 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1221724142099 and 1221724142108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221724142173) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1943130 + ... + 2493832.

It is an arithmetic number, because the mean of its divisors is an integer number (152932703616).

Almost surely, 2^{1221724142143} is an apocalyptic number.

1221724142143 is a deficient number, since it is larger than the sum of its proper divisors (1737486785).

1221724142143 is a wasteful number, since it uses less digits than its factorization.

1221724142143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 553853.

The product of its digits is 21504, while the sum is 34.

The spelling of 1221724142143 in words is "one trillion, two hundred twenty-one billion, seven hundred twenty-four million, one hundred forty-two thousand, one hundred forty-three".