21234061571 has 4 divisors (see below), whose sum is σ = 21234396000. Its totient is φ = 21233727144.

The previous prime is 21234061507. The next prime is 21234061577. The reversal of 21234061571 is 17516043212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21234061571 - 2⁶ = 21234061507 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21234061577) 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, 39416 + ... + 209813.

It is an arithmetic number, because the mean of its divisors is an integer number (5308599000).

Almost surely, 2^21234061571 is an apocalyptic number.

21234061571 is a deficient number, since it is larger than the sum of its proper divisors (334429).

21234061571 is an equidigital number, since it uses as much as digits as its factorization.

21234061571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334428.

The product of its (nonzero) digits is 10080, while the sum is 32.

The spelling of 21234061571 in words is "twenty-one billion, two hundred thirty-four million, sixty-one thousand, five hundred seventy-one".