22154220521 has 2 divisors, whose sum is σ = 22154220522. Its totient is φ = 22154220520.

The previous prime is 22154220511. The next prime is 22154220551. The reversal of 22154220521 is 12502245122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19730135296 + 2424085225 = 140464^2 + 49235^2 .

It is a cyclic number.

It is not a de Polignac number, because 22154220521 - 2³⁴ = 4974351337 is a prime.

It is a super-2 number, since 2×22154220521² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (22154220511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11077110260 + 11077110261.

It is an arithmetic number, because the mean of its divisors is an integer number (11077110261).

Almost surely, 2^22154220521 is an apocalyptic number.

It is an amenable number.

22154220521 is a deficient number, since it is larger than the sum of its proper divisors (1).

22154220521 is an equidigital number, since it uses as much as digits as its factorization.

22154220521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3200, while the sum is 26.

Adding to 22154220521 its reverse (12502245122), we get a palindrome (34656465643).

The spelling of 22154220521 in words is "twenty-two billion, one hundred fifty-four million, two hundred twenty thousand, five hundred twenty-one".