21514668 has 48 divisors (see below), whose sum is σ = 58781184. Its totient is φ = 5996160.

The previous prime is 21514667. The next prime is 21514687. The reversal of 21514668 is 86641512.

It is not an unprimeable number, because it can be changed into a prime (21514667) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 321 + ... + 6567.

It is an arithmetic number, because the mean of its divisors is an integer number (1224608).

Almost surely, 2^21514668 is an apocalyptic number.

21514668 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21514668, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29390592).

21514668 is an abundant number, since it is smaller than the sum of its proper divisors (37266516).

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

21514668 is a wasteful number, since it uses less digits than its factorization.

21514668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6302 (or 6300 counting only the distinct ones).

The product of its digits is 11520, while the sum is 33.

The square root of 21514668 is about 4638.3906691869. The cubic root of 21514668 is about 278.1281089246.

It can be divided in two parts, 2 and 1514668, that added together give a triangular number (1514670 = T₁₇₄₀).

The spelling of 21514668 in words is "twenty-one million, five hundred fourteen thousand, six hundred sixty-eight".