21167712147 has 8 divisors (see below), whose sum is σ = 29709069760. Its totient is φ = 13369081320.

The previous prime is 21167712143. The next prime is 21167712179. The reversal of 21167712147 is 74121776112.

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

It is not a de Polignac number, because 21167712147 - 2² = 21167712143 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21167712143) 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, 185681629 + ... + 185681742.

It is an arithmetic number, because the mean of its divisors is an integer number (3713633720).

Almost surely, 2^21167712147 is an apocalyptic number.

21167712147 is a deficient number, since it is larger than the sum of its proper divisors (8541357613).

21167712147 is a wasteful number, since it uses less digits than its factorization.

21167712147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 371363393.

The product of its digits is 32928, while the sum is 39.

The spelling of 21167712147 in words is "twenty-one billion, one hundred sixty-seven million, seven hundred twelve thousand, one hundred forty-seven".