142340623921 has 2 divisors, whose sum is σ = 142340623922. Its totient is φ = 142340623920.

The previous prime is 142340623891. The next prime is 142340623927. The reversal of 142340623921 is 129326043241.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72783946225 + 69556677696 = 269785^2 + 263736^2 .

It is an emirp because it is prime and its reverse (129326043241) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 142340623921 - 2⁹ = 142340623409 is a prime.

It is not a weakly prime, because it can be changed into another prime (142340623927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71170311960 + 71170311961.

It is an arithmetic number, because the mean of its divisors is an integer number (71170311961).

Almost surely, 2^142340623921 is an apocalyptic number.

It is an amenable number.

142340623921 is a deficient number, since it is larger than the sum of its proper divisors (1).

142340623921 is an equidigital number, since it uses as much as digits as its factorization.

142340623921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 62208, while the sum is 37.

The spelling of 142340623921 in words is "one hundred forty-two billion, three hundred forty million, six hundred twenty-three thousand, nine hundred twenty-one".