21053376571 has 4 divisors (see below), whose sum is σ = 21239689752. Its totient is φ = 20867063392.

The previous prime is 21053376527. The next prime is 21053376593. The reversal of 21053376571 is 17567335012.

It is a happy number.

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 21053376571 - 2⁹ = 21053376059 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21053376871) 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, 93156421 + ... + 93156646.

It is an arithmetic number, because the mean of its divisors is an integer number (5309922438).

Almost surely, 2^21053376571 is an apocalyptic number.

21053376571 is a deficient number, since it is larger than the sum of its proper divisors (186313181).

21053376571 is a wasteful number, since it uses less digits than its factorization.

21053376571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186313180.

The product of its (nonzero) digits is 132300, while the sum is 40.

The spelling of 21053376571 in words is "twenty-one billion, fifty-three million, three hundred seventy-six thousand, five hundred seventy-one".