21739040571 has 8 divisors (see below), whose sum is σ = 30245621760. Its totient is φ = 13862576552.

The previous prime is 21739040567. The next prime is 21739040573. The reversal of 21739040571 is 17504093712.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21739040571 - 2² = 21739040567 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21739040573) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 157529211 + ... + 157529348.

It is an arithmetic number, because the mean of its divisors is an integer number (3780702720).

Almost surely, 2^21739040571 is an apocalyptic number.

21739040571 is a deficient number, since it is larger than the sum of its proper divisors (8506581189).

21739040571 is a wasteful number, since it uses less digits than its factorization.

21739040571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315058585.

The product of its (nonzero) digits is 52920, while the sum is 39.

The spelling of 21739040571 in words is "twenty-one billion, seven hundred thirty-nine million, forty thousand, five hundred seventy-one".