21160004 has 12 divisors (see below), whose sum is σ = 38031084. Its totient is φ = 10293984.

The previous prime is 21160003. The next prime is 21160021. The reversal of 21160004 is 40006112.

It can be written as a sum of positive squares in 2 ways, for example, as 18939904 + 2220100 = 4352^2 + 1490^2 .

It is not an unprimeable number, because it can be changed into a prime (21160001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71339 + ... + 71634.

It is an arithmetic number, because the mean of its divisors is an integer number (3169257).

Almost surely, 2^21160004 is an apocalyptic number.

It is an amenable number.

21160004 is a deficient number, since it is larger than the sum of its proper divisors (16871080).

21160004 is a wasteful number, since it uses less digits than its factorization.

21160004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143014 (or 143012 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 21160004 is about 4600.0004347826. Note that the first 3 decimals coincide. The cubic root of 21160004 is about 276.5913422142.

Adding to 21160004 its reverse (40006112), we get a palindrome (61166116).

The spelling of 21160004 in words is "twenty-one million, one hundred sixty thousand, four".