21122052 has 48 divisors (see below), whose sum is σ = 57708672. Its totient is φ = 5886720.

The previous prime is 21122033. The next prime is 21122069. The reversal of 21122052 is 25022112.

It is a super-2 number, since 2×21122052² = 892282161381408, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 378 + ... + 6510.

It is an arithmetic number, because the mean of its divisors is an integer number (1202264).

Almost surely, 2^21122052 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21122052, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28854336).

21122052 is an abundant number, since it is smaller than the sum of its proper divisors (36586620).

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

21122052 is a wasteful number, since it uses less digits than its factorization.

21122052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6188 (or 6186 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 21122052 is about 4595.8733664016. The cubic root of 21122052 is about 276.4258810497.

Adding to 21122052 its reverse (25022112), we get a palindrome (46144164).

The spelling of 21122052 in words is "twenty-one million, one hundred twenty-two thousand, fifty-two".