21571520010 has 32 divisors (see below), whose sum is σ = 51780961152. Its totient is φ = 5751370560.

The previous prime is 21571519969. The next prime is 21571520039. The reversal of 21571520010 is 1002517512.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 112867 + ... + 236393.

It is an arithmetic number, because the mean of its divisors is an integer number (1618155036).

Almost surely, 2^21571520010 is an apocalyptic number.

21571520010 is an abundant number, since it is smaller than the sum of its proper divisors (30209441142).

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

21571520010 is a wasteful number, since it uses less digits than its factorization.

21571520010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129358.

The product of its (nonzero) digits is 700, while the sum is 24.

The spelling of 21571520010 in words is "twenty-one billion, five hundred seventy-one million, five hundred twenty thousand, ten".