51422222021 has 2 divisors, whose sum is σ = 51422222022. Its totient is φ = 51422222020.

The previous prime is 51422221993. The next prime is 51422222023. The reversal of 51422222021 is 12022222415.

51422222021 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., 51089560900 + 332661121 = 226030^2 + 18239^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51422222021 is a prime.

Together with 51422222023, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51422222023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25711111010 + 25711111011.

It is an arithmetic number, because the mean of its divisors is an integer number (25711111011).

Almost surely, 2^51422222021 is an apocalyptic number.

It is an amenable number.

51422222021 is a deficient number, since it is larger than the sum of its proper divisors (1).

51422222021 is an equidigital number, since it uses as much as digits as its factorization.

51422222021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1280, while the sum is 23.

Adding to 51422222021 its reverse (12022222415), we get a palindrome (63444444436).

The spelling of 51422222021 in words is "fifty-one billion, four hundred twenty-two million, two hundred twenty-two thousand, twenty-one".