21145745484 has 18 divisors (see below), whose sum is σ = 53451745620. Its totient is φ = 7048581816.

The previous prime is 21145745479. The next prime is 21145745501. The reversal of 21145745484 is 48454754112.

21145745484 is a `hidden beast` number, since 2 + 114 + 5 + 7 + 454 + 84 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 293690874 + ... + 293690945.

Almost surely, 2^21145745484 is an apocalyptic number.

It is an amenable number.

21145745484 is an abundant number, since it is smaller than the sum of its proper divisors (32306000136).

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

21145745484 is a wasteful number, since it uses less digits than its factorization.

21145745484 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 587381829 (or 587381824 counting only the distinct ones).

The product of its digits is 716800, while the sum is 45.

The spelling of 21145745484 in words is "twenty-one billion, one hundred forty-five million, seven hundred forty-five thousand, four hundred eighty-four".