21203120299 has 2 divisors, whose sum is σ = 21203120300. Its totient is φ = 21203120298.

The previous prime is 21203120219. The next prime is 21203120347. The reversal of 21203120299 is 99202130212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21203120299 - 2¹⁹ = 21202596011 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21203120299.

It is not a weakly prime, because it can be changed into another prime (21203120219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10601560149 + 10601560150.

It is an arithmetic number, because the mean of its divisors is an integer number (10601560150).

Almost surely, 2^21203120299 is an apocalyptic number.

21203120299 is a deficient number, since it is larger than the sum of its proper divisors (1).

21203120299 is an equidigital number, since it uses as much as digits as its factorization.

21203120299 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 31.

The spelling of 21203120299 in words is "twenty-one billion, two hundred three million, one hundred twenty thousand, two hundred ninety-nine".