213143243969 has 2 divisors, whose sum is σ = 213143243970. Its totient is φ = 213143243968.

The previous prime is 213143243959. The next prime is 213143244019. The reversal of 213143243969 is 969342341312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 177152601025 + 35990642944 = 420895^2 + 189712^2 .

It is a cyclic number.

It is not a de Polignac number, because 213143243969 - 2¹⁶ = 213143178433 is a prime.

It is a super-2 number, since 2×213143243969² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (213143243959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106571621984 + 106571621985.

It is an arithmetic number, because the mean of its divisors is an integer number (106571621985).

Almost surely, 2^213143243969 is an apocalyptic number.

It is an amenable number.

213143243969 is a deficient number, since it is larger than the sum of its proper divisors (1).

213143243969 is an equidigital number, since it uses as much as digits as its factorization.

213143243969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 839808, while the sum is 47.

The spelling of 213143243969 in words is "two hundred thirteen billion, one hundred forty-three million, two hundred forty-three thousand, nine hundred sixty-nine".