21542071008 has 24 divisors (see below), whose sum is σ = 56547936648. Its totient is φ = 7180690304.

The previous prime is 21542071007. The next prime is 21542071043. The reversal of 21542071008 is 80017024512.

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21542071007) 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, 112198191 + ... + 112198382.

It is an arithmetic number, because the mean of its divisors is an integer number (2356164027).

Almost surely, 2^21542071008 is an apocalyptic number.

It is an amenable number.

21542071008 is an abundant number, since it is smaller than the sum of its proper divisors (35005865640).

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

21542071008 is a wasteful number, since it uses less digits than its factorization.

21542071008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224396586 (or 224396578 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 30.

The spelling of 21542071008 in words is "twenty-one billion, five hundred forty-two million, seventy-one thousand, eight".