21171574000 has 80 divisors (see below), whose sum is σ = 52844403456. Its totient is φ = 8195424000.

The previous prime is 21171573979. The next prime is 21171574009. The reversal of 21171574000 is 47517112.

It is a tau number, because it is divible by the number of its divisors (80).

It is a self number, because there is not a number n which added to its sum of digits gives 21171574000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21171574009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 108739 + ... + 232738.

Almost surely, 2^21171574000 is an apocalyptic number.

21171574000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21171574000 is an abundant number, since it is smaller than the sum of its proper divisors (31672829456).

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

21171574000 is a wasteful number, since it uses less digits than its factorization.

21171574000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 341531 (or 341515 counting only the distinct ones).

The product of its (nonzero) digits is 1960, while the sum is 28.

The spelling of 21171574000 in words is "twenty-one billion, one hundred seventy-one million, five hundred seventy-four thousand".