20613422251 has 2 divisors, whose sum is σ = 20613422252. Its totient is φ = 20613422250.

The previous prime is 20613422209. The next prime is 20613422257. The reversal of 20613422251 is 15222431602.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20613422251 - 2¹⁵ = 20613389483 is a prime.

It is not a weakly prime, because it can be changed into another prime (20613422257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10306711125 + 10306711126.

It is an arithmetic number, because the mean of its divisors is an integer number (10306711126).

Almost surely, 2^20613422251 is an apocalyptic number.

20613422251 is a deficient number, since it is larger than the sum of its proper divisors (1).

20613422251 is an equidigital number, since it uses as much as digits as its factorization.

20613422251 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5760, while the sum is 28.

Adding to 20613422251 its reverse (15222431602), we get a palindrome (35835853853).

The spelling of 20613422251 in words is "twenty billion, six hundred thirteen million, four hundred twenty-two thousand, two hundred fifty-one".