20961299 has 2 divisors, whose sum is σ = 20961300. Its totient is φ = 20961298.

The previous prime is 20961263. The next prime is 20961319. The reversal of 20961299 is 99216902.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20961299 - 2⁸ = 20961043 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20901299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10480649 + 10480650.

It is an arithmetic number, because the mean of its divisors is an integer number (10480650).

Almost surely, 2^20961299 is an apocalyptic number.

20961299 is a deficient number, since it is larger than the sum of its proper divisors (1).

20961299 is an equidigital number, since it uses as much as digits as its factorization.

20961299 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17496, while the sum is 38.

The square root of 20961299 is about 4578.3511224020. The cubic root of 20961299 is about 275.7228322688.

The spelling of 20961299 in words is "twenty million, nine hundred sixty-one thousand, two hundred ninety-nine".