21454386084 has 30 divisors (see below), whose sum is σ = 56086003974. Its totient is φ = 7151461920.

The previous prime is 21454386049. The next prime is 21454386089. The reversal of 21454386084 is 48068345412.

21454386084 is a `hidden beast` number, since 2 + 1 + 4 + 5 + 4 + 38 + 608 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 19085422500 + 2368963584 = 138150^2 + 48672^2 .

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (21454386089) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 33108297 + ... + 33108944.

Almost surely, 2^21454386084 is an apocalyptic number.

It is an amenable number.

21454386084 is an abundant number, since it is smaller than the sum of its proper divisors (34631617890).

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

21454386084 is a wasteful number, since it uses less digits than its factorization.

21454386084 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66217257 (or 66217246 counting only the distinct ones).

The product of its (nonzero) digits is 737280, while the sum is 45.

The spelling of 21454386084 in words is "twenty-one billion, four hundred fifty-four million, three hundred eighty-six thousand, eighty-four".