21601046 has 4 divisors (see below), whose sum is σ = 32401572. Its totient is φ = 10800522.

The previous prime is 21600991. The next prime is 21601061. The reversal of 21601046 is 64010612.

It is a happy number.

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, 5400260 + ... + 5400263.

It is an arithmetic number, because the mean of its divisors is an integer number (8100393).

Almost surely, 2^21601046 is an apocalyptic number.

21601046 is a deficient number, since it is larger than the sum of its proper divisors (10800526).

21601046 is a wasteful number, since it uses less digits than its factorization.

21601046 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10800525.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 21601046 is about 4647.6925457694. The cubic root of 21601046 is about 278.4998254089.

Adding to 21601046 its reverse (64010612), we get a palindrome (85611658).

The spelling of 21601046 in words is "twenty-one million, six hundred one thousand, forty-six".