21055455012 has 12 divisors (see below), whose sum is σ = 49129395056. Its totient is φ = 7018485000.

The previous prime is 21055455011. The next prime is 21055455049.

21055455012 is nontrivially palindromic in base 10.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (21055455011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 877310614 + ... + 877310637.

Almost surely, 2^21055455012 is an apocalyptic number.

It is an amenable number.

21055455012 is an abundant number, since it is smaller than the sum of its proper divisors (28073940044).

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

21055455012 is a wasteful number, since it uses less digits than its factorization.

21055455012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1754621258 (or 1754621256 counting only the distinct ones).

The product of its (nonzero) digits is 10000, while the sum is 30.

The spelling of 21055455012 in words is "twenty-one billion, fifty-five million, four hundred fifty-five thousand, twelve".