21051126520260 has 192 divisors, whose sum is σ = 60238310211072. Its totient is φ = 5490952556544.

The previous prime is 21051126520199. The next prime is 21051126520301. The reversal of 21051126520260 is 6202562115012.

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, 1893592222 + ... + 1893603338.

It is an arithmetic number, because the mean of its divisors is an integer number (313741199016).

Almost surely, 2^{21051126520260} is an apocalyptic number.

21051126520260 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21051126520260, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30119155105536).

21051126520260 is an abundant number, since it is smaller than the sum of its proper divisors (39187183690812).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21051126520260 is a wasteful number, since it uses less digits than its factorization.

21051126520260 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12942 (or 12940 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 33.

Adding to 21051126520260 its reverse (6202562115012), we get a palindrome (27253688635272).

The spelling of 21051126520260 in words is "twenty-one trillion, fifty-one billion, one hundred twenty-six million, five hundred twenty thousand, two hundred sixty".