22721051 has 2 divisors, whose sum is σ = 22721052. Its totient is φ = 22721050.

The previous prime is 22721029. The next prime is 22721053. The reversal of 22721051 is 15012722.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 22721051 - 2¹⁸ = 22458907 is a prime.

Together with 22721053, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (22721053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11360525 + 11360526.

It is an arithmetic number, because the mean of its divisors is an integer number (11360526).

Almost surely, 2^22721051 is an apocalyptic number.

22721051 is a deficient number, since it is larger than the sum of its proper divisors (1).

22721051 is an equidigital number, since it uses as much as digits as its factorization.

22721051 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 280, while the sum is 20.

The square root of 22721051 is about 4766.6603613012. The cubic root of 22721051 is about 283.2323172380.

Adding to 22721051 its reverse (15012722), we get a palindrome (37733773).

The spelling of 22721051 in words is "twenty-two million, seven hundred twenty-one thousand, fifty-one".