21160434 has 16 divisors (see below), whose sum is σ = 43221888. Its totient is φ = 6903312.

The previous prime is 21160397. The next prime is 21160439. The reversal of 21160434 is 43406112.

It is a self number, because there is not a number n which added to its sum of digits gives 21160434.

It is not an unprimeable number, because it can be changed into a prime (21160439) 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, 37237 + ... + 37800.

It is an arithmetic number, because the mean of its divisors is an integer number (2701368).

Almost surely, 2^21160434 is an apocalyptic number.

21160434 is an abundant number, since it is smaller than the sum of its proper divisors (22061454).

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

21160434 is a wasteful number, since it uses less digits than its factorization.

21160434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75089.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 21160434 is about 4600.0471736712. The cubic root of 21160434 is about 276.5932157720.

Adding to 21160434 its reverse (43406112), we get a palindrome (64566546).

The spelling of 21160434 in words is "twenty-one million, one hundred sixty thousand, four hundred thirty-four".