21007914 has 16 divisors (see below), whose sum is σ = 42178752. Its totient is φ = 6975488.

The previous prime is 21007913. The next prime is 21007963. The reversal of 21007914 is 41970012.

It is not an unprimeable number, because it can be changed into a prime (21007913) 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, 5079 + ... + 8234.

It is an arithmetic number, because the mean of its divisors is an integer number (2636172).

Almost surely, 2^21007914 is an apocalyptic number.

21007914 is an abundant number, since it is smaller than the sum of its proper divisors (21170838).

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

21007914 is a wasteful number, since it uses less digits than its factorization.

21007914 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13581.

The product of its (nonzero) digits is 504, while the sum is 24.

The square root of 21007914 is about 4583.4391018099. The cubic root of 21007914 is about 275.9270706281.

Adding to 21007914 its reverse (41970012), we get a palindrome (62977926).

The spelling of 21007914 in words is "twenty-one million, seven thousand, nine hundred fourteen".