21051168 has 48 divisors (see below), whose sum is σ = 58514400. Its totient is φ = 6603776.

The previous prime is 21051143. The next prime is 21051193. The reversal of 21051168 is 86115012.

It is an interprime number because it is at equal distance from previous prime (21051143) and next prime (21051193).

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4818 + ... + 8081.

It is an arithmetic number, because the mean of its divisors is an integer number (1219050).

Almost surely, 2^21051168 is an apocalyptic number.

It is an amenable number.

21051168 is an abundant number, since it is smaller than the sum of its proper divisors (37463232).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21051168 is a wasteful number, since it uses less digits than its factorization.

21051168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12929 (or 12921 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 24.

The square root of 21051168 is about 4588.1551848210. The cubic root of 21051168 is about 276.1163130848.

The spelling of 21051168 in words is "twenty-one million, fifty-one thousand, one hundred sixty-eight".