21367315671 has 16 divisors (see below), whose sum is σ = 30962759520. Its totient is φ = 13028480640.

The previous prime is 21367315667. The next prime is 21367315709. The reversal of 21367315671 is 17651376312.

It is not a de Polignac number, because 21367315671 - 2² = 21367315667 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21367305671) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2508960 + ... + 2517461.

It is an arithmetic number, because the mean of its divisors is an integer number (1935172470).

Almost surely, 2^21367315671 is an apocalyptic number.

21367315671 is a deficient number, since it is larger than the sum of its proper divisors (9595443849).

21367315671 is a wasteful number, since it uses less digits than its factorization.

21367315671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5026546.

The product of its digits is 158760, while the sum is 42.

The spelling of 21367315671 in words is "twenty-one billion, three hundred sixty-seven million, three hundred fifteen thousand, six hundred seventy-one".