2658291221 has 2 divisors, whose sum is σ = 2658291222. Its totient is φ = 2658291220.

The previous prime is 2658291179. The next prime is 2658291227. The reversal of 2658291221 is 1221928562.

2658291221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1788867025 + 869424196 = 42295^2 + 29486^2 .

It is a cyclic number.

It is not a de Polignac number, because 2658291221 - 2²⁶ = 2591182357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2658291227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1329145610 + 1329145611.

It is an arithmetic number, because the mean of its divisors is an integer number (1329145611).

Almost surely, 2^2658291221 is an apocalyptic number.

It is an amenable number.

2658291221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2658291221 is an equidigital number, since it uses as much as digits as its factorization.

2658291221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34560, while the sum is 38.

The square root of 2658291221 is about 51558.6192697206. The cubic root of 2658291221 is about 1385.2692236869.

The spelling of 2658291221 in words is "two billion, six hundred fifty-eight million, two hundred ninety-one thousand, two hundred twenty-one".