2143579121 has 2 divisors, whose sum is σ = 2143579122. Its totient is φ = 2143579120.

The previous prime is 2143579099. The next prime is 2143579159. The reversal of 2143579121 is 1219753412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1422119521 + 721459600 = 37711^2 + 26860^2 .

It is a cyclic number.

It is not a de Polignac number, because 2143579121 - 2¹⁰ = 2143578097 is a prime.

It is not a weakly prime, because it can be changed into another prime (2143579171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1071789560 + 1071789561.

It is an arithmetic number, because the mean of its divisors is an integer number (1071789561).

Almost surely, 2^2143579121 is an apocalyptic number.

It is an amenable number.

2143579121 is a deficient number, since it is larger than the sum of its proper divisors (1).

2143579121 is an equidigital number, since it uses as much as digits as its factorization.

2143579121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15120, while the sum is 35.

The square root of 2143579121 is about 46298.8025871080. The cubic root of 2143579121 is about 1289.3767638250.

The spelling of 2143579121 in words is "two billion, one hundred forty-three million, five hundred seventy-nine thousand, one hundred twenty-one".