61266512211021 has 12 divisors (see below), whose sum is σ = 95303463439548. Its totient is φ = 37702469052864.

The previous prime is 61266512211007. The next prime is 61266512211041. The reversal of 61266512211021 is 12011221566216.

61266512211021 is a `hidden beast` number, since 6 + 1 + 2 + 6 + 6 + 512 + 2 + 110 + 21 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 35891002628100 + 25375509582921 = 5990910^2 + 5037411^2 .

It is not a de Polignac number, because 61266512211021 - 2⁴⁵ = 26082140122189 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61266512211001) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 261822701640 + ... + 261822701873.

It is an arithmetic number, because the mean of its divisors is an integer number (7941955286629).

Almost surely, 2^{61266512211021} is an apocalyptic number.

It is an amenable number.

61266512211021 is a deficient number, since it is larger than the sum of its proper divisors (34036951228527).

61266512211021 is a wasteful number, since it uses less digits than its factorization.

61266512211021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 523645403532 (or 523645403529 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

Adding to 61266512211021 its reverse (12011221566216), we get a palindrome (73277733777237).

The spelling of 61266512211021 in words is "sixty-one trillion, two hundred sixty-six billion, five hundred twelve million, two hundred eleven thousand, twenty-one".