213203099981 has 2 divisors, whose sum is σ = 213203099982. Its totient is φ = 213203099980.

The previous prime is 213203099951. The next prime is 213203100001. The reversal of 213203099981 is 189990302312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 160507601956 + 52695498025 = 400634^2 + 229555^2 .

It is a cyclic number.

It is not a de Polignac number, because 213203099981 - 2¹⁰ = 213203098957 is a prime.

It is a super-2 number, since 2×213203099981² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213203099951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106601549990 + 106601549991.

It is an arithmetic number, because the mean of its divisors is an integer number (106601549991).

Almost surely, 2^213203099981 is an apocalyptic number.

It is an amenable number.

213203099981 is a deficient number, since it is larger than the sum of its proper divisors (1).

213203099981 is an equidigital number, since it uses as much as digits as its factorization.

213203099981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 209952, while the sum is 47.

The spelling of 213203099981 in words is "two hundred thirteen billion, two hundred three million, ninety-nine thousand, nine hundred eighty-one".