213322981 has 2 divisors, whose sum is σ = 213322982. Its totient is φ = 213322980.

The previous prime is 213322969. The next prime is 213323029. The reversal of 213322981 is 189223312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 170302500 + 43020481 = 13050^2 + 6559^2 .

It is a cyclic number.

It is not a de Polignac number, because 213322981 - 2¹³ = 213314789 is a prime.

It is a super-2 number, since 2×213322981² = 91013388445452722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213322951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106661490 + 106661491.

It is an arithmetic number, because the mean of its divisors is an integer number (106661491).

Almost surely, 2^213322981 is an apocalyptic number.

It is an amenable number.

213322981 is a deficient number, since it is larger than the sum of its proper divisors (1).

213322981 is an equidigital number, since it uses as much as digits as its factorization.

213322981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5184, while the sum is 31.

The square root of 213322981 is about 14605.5804745994. The cubic root of 213322981 is about 597.5109675105.

The spelling of 213322981 in words is "two hundred thirteen million, three hundred twenty-two thousand, nine hundred eighty-one".