21122616 has 16 divisors (see below), whose sum is σ = 52806600. Its totient is φ = 7040864.

The previous prime is 21122611. The next prime is 21122641. The reversal of 21122616 is 61622112.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 21122592 and 21122601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21122611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 440031 + ... + 440078.

Almost surely, 2^21122616 is an apocalyptic number.

It is an amenable number.

21122616 is an abundant number, since it is smaller than the sum of its proper divisors (31683984).

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

21122616 is a wasteful number, since it uses less digits than its factorization.

21122616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 880118 (or 880114 counting only the distinct ones).

The product of its digits is 288, while the sum is 21.

The square root of 21122616 is about 4595.9347253850. The cubic root of 21122616 is about 276.4283413979.

Adding to 21122616 its reverse (61622112), we get a palindrome (82744728).

The spelling of 21122616 in words is "twenty-one million, one hundred twenty-two thousand, six hundred sixteen".