21148967 has 8 divisors (see below), whose sum is σ = 24385056. Its totient is φ = 17966592.

The previous prime is 21148927. The next prime is 21148973. The reversal of 21148967 is 76984112.

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

It is not a de Polignac number, because 21148967 - 2¹⁰ = 21147943 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 21148967.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21148927) 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, 12578 + ... + 14159.

It is an arithmetic number, because the mean of its divisors is an integer number (3048132).

Almost surely, 2^21148967 is an apocalyptic number.

21148967 is a deficient number, since it is larger than the sum of its proper divisors (3236089).

21148967 is a wasteful number, since it uses less digits than its factorization.

21148967 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26857.

The product of its digits is 24192, while the sum is 38.

The square root of 21148967 is about 4598.8006045055. The cubic root of 21148967 is about 276.5432440890.

The spelling of 21148967 in words is "twenty-one million, one hundred forty-eight thousand, nine hundred sixty-seven".