21203020339 has 2 divisors, whose sum is σ = 21203020340. Its totient is φ = 21203020338.

The previous prime is 21203020297. The next prime is 21203020367. The reversal of 21203020339 is 93302030212.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21203020339 is a prime.

It is not a weakly prime, because it can be changed into another prime (21203020739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10601510169 + 10601510170.

It is an arithmetic number, because the mean of its divisors is an integer number (10601510170).

Almost surely, 2^21203020339 is an apocalyptic number.

21203020339 is a deficient number, since it is larger than the sum of its proper divisors (1).

21203020339 is an equidigital number, since it uses as much as digits as its factorization.

21203020339 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 25.

The spelling of 21203020339 in words is "twenty-one billion, two hundred three million, twenty thousand, three hundred thirty-nine".