21551322544115 has 32 divisors (see below), whose sum is σ = 32138671358976. Its totient is φ = 13508837078400.

The previous prime is 21551322544097. The next prime is 21551322544121. The reversal of 21551322544115 is 51144522315512.

It is not a de Polignac number, because 21551322544115 - 2¹² = 21551322540019 is a prime.

It is a super-2 number, since 2×21551322544115² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 229882961 + ... + 229976690.

It is an arithmetic number, because the mean of its divisors is an integer number (1004333479968).

Almost surely, 2^{21551322544115} is an apocalyptic number.

21551322544115 is a deficient number, since it is larger than the sum of its proper divisors (10587348814861).

21551322544115 is a wasteful number, since it uses less digits than its factorization.

21551322544115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 459859779.

The product of its digits is 240000, while the sum is 41.

Adding to 21551322544115 its reverse (51144522315512), we get a palindrome (72695844859627).

The spelling of 21551322544115 in words is "twenty-one trillion, five hundred fifty-one billion, three hundred twenty-two million, five hundred forty-four thousand, one hundred fifteen".