21485641971 has 8 divisors (see below), whose sum is σ = 28663927744. Its totient is φ = 14315558760.

The previous prime is 21485641967. The next prime is 21485641987. The reversal of 21485641971 is 17914658412.

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

It is not a de Polignac number, because 21485641971 - 2² = 21485641967 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21485641971.

It is not an unprimeable number, because it can be changed into a prime (21485641171) 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, 2044525 + ... + 2055006.

It is an arithmetic number, because the mean of its divisors is an integer number (3582990968).

Almost surely, 2^21485641971 is an apocalyptic number.

21485641971 is a deficient number, since it is larger than the sum of its proper divisors (7178285773).

21485641971 is a wasteful number, since it uses less digits than its factorization.

21485641971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4101281.

The product of its digits is 483840, while the sum is 48.

The spelling of 21485641971 in words is "twenty-one billion, four hundred eighty-five million, six hundred forty-one thousand, nine hundred seventy-one".