21380798167 has 8 divisors (see below), whose sum is σ = 21489336752. Its totient is φ = 21272328000.

The previous prime is 21380798147. The next prime is 21380798191. The reversal of 21380798167 is 76189708312.

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

It is a cyclic number.

It is not a de Polignac number, because 21380798167 - 2³¹ = 19233314519 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21380798147) 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, 681163 + ... + 711859.

It is an arithmetic number, because the mean of its divisors is an integer number (2686167094).

Almost surely, 2^21380798167 is an apocalyptic number.

21380798167 is a deficient number, since it is larger than the sum of its proper divisors (108538585).

21380798167 is a wasteful number, since it uses less digits than its factorization.

21380798167 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34209.

The product of its (nonzero) digits is 1016064, while the sum is 52.

The spelling of 21380798167 in words is "twenty-one billion, three hundred eighty million, seven hundred ninety-eight thousand, one hundred sixty-seven".