212011013261 has 2 divisors, whose sum is σ = 212011013262. Its totient is φ = 212011013260.

The previous prime is 212011013257. The next prime is 212011013287. The reversal of 212011013261 is 162310110212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 155231272036 + 56779741225 = 393994^2 + 238285^2 .

It is a cyclic number.

It is not a de Polignac number, because 212011013261 - 2² = 212011013257 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212011013861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106005506630 + 106005506631.

It is an arithmetic number, because the mean of its divisors is an integer number (106005506631).

Almost surely, 2^212011013261 is an apocalyptic number.

It is an amenable number.

212011013261 is a deficient number, since it is larger than the sum of its proper divisors (1).

212011013261 is an equidigital number, since it uses as much as digits as its factorization.

212011013261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 212011013261 its reverse (162310110212), we get a palindrome (374321123473).

The spelling of 212011013261 in words is "two hundred twelve billion, eleven million, thirteen thousand, two hundred sixty-one".