21161302 has 4 divisors (see below), whose sum is σ = 31741956. Its totient is φ = 10580650.

The previous prime is 21161297. The next prime is 21161317. The reversal of 21161302 is 20316112.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5290324 + ... + 5290327.

It is an arithmetic number, because the mean of its divisors is an integer number (7935489).

Almost surely, 2^21161302 is an apocalyptic number.

21161302 is a deficient number, since it is larger than the sum of its proper divisors (10580654).

21161302 is a wasteful number, since it uses less digits than its factorization.

21161302 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10580653.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 21161302 is about 4600.1415195622. The cubic root of 21161302 is about 276.5969976672.

Adding to 21161302 its reverse (20316112), we get a palindrome (41477414).

The spelling of 21161302 in words is "twenty-one million, one hundred sixty-one thousand, three hundred two".