21122016 has 24 divisors (see below), whose sum is σ = 55445544. Its totient is φ = 7040640.

The previous prime is 21122009. The next prime is 21122033. The reversal of 21122016 is 61022112.

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-2 number, since 2×21122016² = 892279119808512, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21121986 and 21122004.

It is a congruent number.

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, 109915 + ... + 110106.

It is an arithmetic number, because the mean of its divisors is an integer number (2310231).

Almost surely, 2^21122016 is an apocalyptic number.

It is an amenable number.

21122016 is an abundant number, since it is smaller than the sum of its proper divisors (34323528).

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

21122016 is a wasteful number, since it uses less digits than its factorization.

21122016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220034 (or 220026 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 21122016 is about 4595.8694498430. The cubic root of 21122016 is about 276.4257240047.

Adding to 21122016 its reverse (61022112), we get a palindrome (82144128).

The spelling of 21122016 in words is "twenty-one million, one hundred twenty-two thousand, sixteen".