21167643716 has 12 divisors (see below), whose sum is σ = 37489682832. Its totient is φ = 10456305768.

The previous prime is 21167643691. The next prime is 21167643719. The reversal of 21167643716 is 61734676112.

It is not an unprimeable number, because it can be changed into a prime (21167643719) 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, 31878650 + ... + 31879313.

It is an arithmetic number, because the mean of its divisors is an integer number (3124140236).

Almost surely, 2^21167643716 is an apocalyptic number.

It is an amenable number.

21167643716 is a deficient number, since it is larger than the sum of its proper divisors (16322039116).

21167643716 is a wasteful number, since it uses less digits than its factorization.

21167643716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63758050 (or 63758048 counting only the distinct ones).

The product of its digits is 254016, while the sum is 44.

The spelling of 21167643716 in words is "twenty-one billion, one hundred sixty-seven million, six hundred forty-three thousand, seven hundred sixteen".