21506680141 has 2 divisors, whose sum is σ = 21506680142. Its totient is φ = 21506680140.

The previous prime is 21506680123. The next prime is 21506680193. The reversal of 21506680141 is 14108660512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15761798116 + 5744882025 = 125546^2 + 75795^2 .

It is a cyclic number.

It is not a de Polignac number, because 21506680141 - 2¹¹ = 21506678093 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21506680097 and 21506680106.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21506687141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10753340070 + 10753340071.

It is an arithmetic number, because the mean of its divisors is an integer number (10753340071).

Almost surely, 2^21506680141 is an apocalyptic number.

It is an amenable number.

21506680141 is a deficient number, since it is larger than the sum of its proper divisors (1).

21506680141 is an equidigital number, since it uses as much as digits as its factorization.

21506680141 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11520, while the sum is 34.

The spelling of 21506680141 in words is "twenty-one billion, five hundred six million, six hundred eighty thousand, one hundred forty-one".