213021030077 has 2 divisors, whose sum is σ = 213021030078. Its totient is φ = 213021030076.

The previous prime is 213021030073. The next prime is 213021030083. The reversal of 213021030077 is 770030120312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 170283323716 + 42737706361 = 412654^2 + 206731^2 .

It is a cyclic number.

It is not a de Polignac number, because 213021030077 - 2² = 213021030073 is a prime.

It is a super-2 number, since 2×213021030077² (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 (213021030071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106510515038 + 106510515039.

It is an arithmetic number, because the mean of its divisors is an integer number (106510515039).

Almost surely, 2^213021030077 is an apocalyptic number.

It is an amenable number.

213021030077 is a deficient number, since it is larger than the sum of its proper divisors (1).

213021030077 is an equidigital number, since it uses as much as digits as its factorization.

213021030077 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1764, while the sum is 26.

Adding to 213021030077 its reverse (770030120312), we get a palindrome (983051150389).

The spelling of 213021030077 in words is "two hundred thirteen billion, twenty-one million, thirty thousand, seventy-seven".