21602116 has 12 divisors (see below), whose sum is σ = 37836288. Its totient is φ = 10791752.

The previous prime is 21602099. The next prime is 21602137. The reversal of 21602116 is 61120612.

It is a junction number, because it is equal to n+sod(n) for n = 21602093 and 21602102.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7605 + ... + 10051.

It is an arithmetic number, because the mean of its divisors is an integer number (3153024).

Almost surely, 2^21602116 is an apocalyptic number.

It is an amenable number.

21602116 is a deficient number, since it is larger than the sum of its proper divisors (16234172).

21602116 is a wasteful number, since it uses less digits than its factorization.

21602116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4658 (or 4656 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 21602116 is about 4647.8076552284. The cubic root of 21602116 is about 278.5044237957.

Adding to 21602116 its reverse (61120612), we get a palindrome (82722728).

The spelling of 21602116 in words is "twenty-one million, six hundred two thousand, one hundred sixteen".