21616202 has 4 divisors (see below), whose sum is σ = 32424306. Its totient is φ = 10808100.

The previous prime is 21616201. The next prime is 21616211. The reversal of 21616202 is 20261612.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 21242881 + 373321 = 4609^2 + 611^2 .

It is not an unprimeable number, because it can be changed into a prime (21616201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5404049 + ... + 5404052.

Almost surely, 2^21616202 is an apocalyptic number.

21616202 is a deficient number, since it is larger than the sum of its proper divisors (10808104).

21616202 is a wasteful number, since it uses less digits than its factorization.

21616202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10808103.

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

The square root of 21616202 is about 4649.3227463793. The cubic root of 21616202 is about 278.5649450418.

Adding to 21616202 its reverse (20261612), we get a palindrome (41877814).

The spelling of 21616202 in words is "twenty-one million, six hundred sixteen thousand, two hundred two".