21571843602 has 16 divisors (see below), whose sum is σ = 43145128512. Its totient is φ = 7190374320.

The previous prime is 21571843577. The next prime is 21571843621. The reversal of 21571843602 is 20634817512.

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 7 ways as a sum of consecutive naturals, for example, 308568 + ... + 371964.

It is an arithmetic number, because the mean of its divisors is an integer number (2696570532).

Almost surely, 2^21571843602 is an apocalyptic number.

21571843602 is an abundant number, since it is smaller than the sum of its proper divisors (21573284910).

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

21571843602 is a wasteful number, since it uses less digits than its factorization.

21571843602 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120113.

The product of its (nonzero) digits is 80640, while the sum is 39.

The spelling of 21571843602 in words is "twenty-one billion, five hundred seventy-one million, eight hundred forty-three thousand, six hundred two".