21922388158225 has 27 divisors (see below), whose sum is σ = 27307725199153. Its totient is φ = 17458295503040.

The previous prime is 21922388158147. The next prime is 21922388158241. The reversal of 21922388158225 is 52285188322912.

The square root of 21922388158225 is 4682135.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 4317348419329 + 17605039738896 = 2077823^2 + 4195836^2 .

It is not a de Polignac number, because 21922388158225 - 2¹⁵ = 21922388125457 is a prime.

It is a super-2 number, since 2×21922388158225² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21922388158225.

It is an unprimeable number.

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 in 26 ways as a sum of consecutive naturals, for example, 5454685266 + ... + 5454689284.

Almost surely, 2^{21922388158225} is an apocalyptic number.

21922388158225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21922388158225 is the 4682135-th square number.

21922388158225 is the 2341068-th centered octagonal number.

It is an amenable number.

21922388158225 is a deficient number, since it is larger than the sum of its proper divisors (5385337040928).

21922388158225 is an frugal number, since it uses more digits than its factorization.

21922388158225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8514 (or 4257 counting only the distinct ones).

The product of its digits is 11059200, while the sum is 58.

The spelling of 21922388158225 in words is "twenty-one trillion, nine hundred twenty-two billion, three hundred eighty-eight million, one hundred fifty-eight thousand, two hundred twenty-five".