21203243141 has 2 divisors, whose sum is σ = 21203243142. Its totient is φ = 21203243140.

The previous prime is 21203243107. The next prime is 21203243147. The reversal of 21203243141 is 14134230212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17934834241 + 3268408900 = 133921^2 + 57170^2 .

It is a cyclic number.

It is not a de Polignac number, because 21203243141 - 2²⁶ = 21136134277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21203243147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10601621570 + 10601621571.

It is an arithmetic number, because the mean of its divisors is an integer number (10601621571).

Almost surely, 2^21203243141 is an apocalyptic number.

It is an amenable number.

21203243141 is a deficient number, since it is larger than the sum of its proper divisors (1).

21203243141 is an equidigital number, since it uses as much as digits as its factorization.

21203243141 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 21203243141 its reverse (14134230212), we get a palindrome (35337473353).

The spelling of 21203243141 in words is "twenty-one billion, two hundred three million, two hundred forty-three thousand, one hundred forty-one".