21203021141 has 2 divisors, whose sum is σ = 21203021142. Its totient is φ = 21203021140.

The previous prime is 21203021107. The next prime is 21203021143. The reversal of 21203021141 is 14112030212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21160066225 + 42954916 = 145465^2 + 6554^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21203021141 is a prime.

Together with 21203021143, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21203021143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10601510570 + 10601510571.

It is an arithmetic number, because the mean of its divisors is an integer number (10601510571).

Almost surely, 2^21203021141 is an apocalyptic number.

It is an amenable number.

21203021141 is a deficient number, since it is larger than the sum of its proper divisors (1).

21203021141 is an equidigital number, since it uses as much as digits as its factorization.

21203021141 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 21203021141 its reverse (14112030212), we get a palindrome (35315051353).

The spelling of 21203021141 in words is "twenty-one billion, two hundred three million, twenty-one thousand, one hundred forty-one".