20213030291 has 2 divisors, whose sum is σ = 20213030292. Its totient is φ = 20213030290.

The previous prime is 20213030287. The next prime is 20213030309. The reversal of 20213030291 is 19203031202.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20213030291 - 2² = 20213030287 is a prime.

It is not a weakly prime, because it can be changed into another prime (20213030191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10106515145 + 10106515146.

It is an arithmetic number, because the mean of its divisors is an integer number (10106515146).

Almost surely, 2^20213030291 is an apocalyptic number.

20213030291 is a deficient number, since it is larger than the sum of its proper divisors (1).

20213030291 is an equidigital number, since it uses as much as digits as its factorization.

20213030291 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 23.

Adding to 20213030291 its reverse (19203031202), we get a palindrome (39416061493).

The spelling of 20213030291 in words is "twenty billion, two hundred thirteen million, thirty thousand, two hundred ninety-one".