20111133061 has 2 divisors, whose sum is σ = 20111133062. Its totient is φ = 20111133060.

The previous prime is 20111132989. The next prime is 20111133101. The reversal of 20111133061 is 16033111102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14985432225 + 5125700836 = 122415^2 + 71594^2 .

It is a cyclic number.

It is not a de Polignac number, because 20111133061 - 2²⁷ = 19976915333 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20111137061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10055566530 + 10055566531.

It is an arithmetic number, because the mean of its divisors is an integer number (10055566531).

Almost surely, 2^20111133061 is an apocalyptic number.

It is an amenable number.

20111133061 is a deficient number, since it is larger than the sum of its proper divisors (1).

20111133061 is an equidigital number, since it uses as much as digits as its factorization.

20111133061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108, while the sum is 19.

Adding to 20111133061 its reverse (16033111102), we get a palindrome (36144244163).

The spelling of 20111133061 in words is "twenty billion, one hundred eleven million, one hundred thirty-three thousand, sixty-one".