21455121763088 has 80 divisors (see below), whose sum is σ = 47412417754800. Its totient is φ = 9317486542848.

The previous prime is 21455121763073. The next prime is 21455121763093. The reversal of 21455121763088 is 88036712155412.

It can be written as a sum of positive squares in 8 ways, for example, as 3665892281104 + 17789229481984 = 1914652^2 + 4217728^2 .

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 15 ways as a sum of consecutive naturals, for example, 13075988 + ... + 14625036.

It is an arithmetic number, because the mean of its divisors is an integer number (592655221935).

Almost surely, 2^{21455121763088} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21455121763088, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23706208877400).

21455121763088 is an abundant number, since it is smaller than the sum of its proper divisors (25957295991712).

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

21455121763088 is a wasteful number, since it uses less digits than its factorization.

21455121763088 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1553004 (or 1552998 counting only the distinct ones).

The product of its (nonzero) digits is 3225600, while the sum is 53.

The spelling of 21455121763088 in words is "twenty-one trillion, four hundred fifty-five billion, one hundred twenty-one million, seven hundred sixty-three thousand, eighty-eight".