213004351997 has 2 divisors, whose sum is σ = 213004351998. Its totient is φ = 213004351996.

The previous prime is 213004351981. The next prime is 213004352027. The reversal of 213004351997 is 799153400312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 183195984196 + 29808367801 = 428014^2 + 172651^2 .

It is a cyclic number.

It is not a de Polignac number, because 213004351997 - 2⁴ = 213004351981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213004351957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106502175998 + 106502175999.

It is an arithmetic number, because the mean of its divisors is an integer number (106502175999).

Almost surely, 2^213004351997 is an apocalyptic number.

It is an amenable number.

213004351997 is a deficient number, since it is larger than the sum of its proper divisors (1).

213004351997 is an equidigital number, since it uses as much as digits as its factorization.

213004351997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 204120, while the sum is 44.

The spelling of 213004351997 in words is "two hundred thirteen billion, four million, three hundred fifty-one thousand, nine hundred ninety-seven".