111010021261 has 2 divisors, whose sum is σ = 111010021262. Its totient is φ = 111010021260.

The previous prime is 111010021217. The next prime is 111010021277. The reversal of 111010021261 is 162120010111.

It is an a-pointer prime, because the next prime (111010021277) can be obtained adding 111010021261 to its sum of digits (16).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 108560365225 + 2449656036 = 329485^2 + 49494^2 .

It is a cyclic number.

It is not a de Polignac number, because 111010021261 - 2¹³ = 111010013069 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111010001261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55505010630 + 55505010631.

It is an arithmetic number, because the mean of its divisors is an integer number (55505010631).

Almost surely, 2^111010021261 is an apocalyptic number.

It is an amenable number.

111010021261 is a deficient number, since it is larger than the sum of its proper divisors (1).

111010021261 is an equidigital number, since it uses as much as digits as its factorization.

111010021261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24, while the sum is 16.

Adding to 111010021261 its reverse (162120010111), we get a palindrome (273130031372).

The spelling of 111010021261 in words is "one hundred eleven billion, ten million, twenty-one thousand, two hundred sixty-one".