216942123901 has 2 divisors, whose sum is σ = 216942123902. Its totient is φ = 216942123900.

The previous prime is 216942123887. The next prime is 216942123949. The reversal of 216942123901 is 109321249612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 201624348676 + 15317775225 = 449026^2 + 123765^2 .

It is a cyclic number.

It is not a de Polignac number, because 216942123901 - 2²⁵ = 216908569469 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216942193901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108471061950 + 108471061951.

It is an arithmetic number, because the mean of its divisors is an integer number (108471061951).

Almost surely, 2^216942123901 is an apocalyptic number.

It is an amenable number.

216942123901 is a deficient number, since it is larger than the sum of its proper divisors (1).

216942123901 is an equidigital number, since it uses as much as digits as its factorization.

216942123901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46656, while the sum is 40.

The spelling of 216942123901 in words is "two hundred sixteen billion, nine hundred forty-two million, one hundred twenty-three thousand, nine hundred one".