21202118141 has 2 divisors, whose sum is σ = 21202118142. Its totient is φ = 21202118140.

The previous prime is 21202118137. The next prime is 21202118227. The reversal of 21202118141 is 14181120212.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17771556100 + 3430562041 = 133310^2 + 58571^2 .

It is a cyclic number.

It is not a de Polignac number, because 21202118141 - 2² = 21202118137 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21202118101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10601059070 + 10601059071.

It is an arithmetic number, because the mean of its divisors is an integer number (10601059071).

Almost surely, 2^21202118141 is an apocalyptic number.

It is an amenable number.

21202118141 is a deficient number, since it is larger than the sum of its proper divisors (1).

21202118141 is an equidigital number, since it uses as much as digits as its factorization.

21202118141 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 256, while the sum is 23.

Adding to 21202118141 its reverse (14181120212), we get a palindrome (35383238353).

The spelling of 21202118141 in words is "twenty-one billion, two hundred two million, one hundred eighteen thousand, one hundred forty-one".