21122251005 has 64 divisors (see below), whose sum is σ = 34680296448. Its totient is φ = 10975426560.

The previous prime is 21122250953. The next prime is 21122251049. The reversal of 21122251005 is 50015222112.

It is not a de Polignac number, because 21122251005 - 2¹⁷ = 21122119933 is a prime.

It is a super-3 number, since 3×21122251005³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 32849214 + ... + 32849856.

It is an arithmetic number, because the mean of its divisors is an integer number (541879632).

Almost surely, 2^21122251005 is an apocalyptic number.

It is an amenable number.

21122251005 is a deficient number, since it is larger than the sum of its proper divisors (13558045443).

21122251005 is a wasteful number, since it uses less digits than its factorization.

21122251005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1066.

The product of its (nonzero) digits is 400, while the sum is 21.

Adding to 21122251005 its reverse (50015222112), we get a palindrome (71137473117).

The spelling of 21122251005 in words is "twenty-one billion, one hundred twenty-two million, two hundred fifty-one thousand, five".