21050052 has 12 divisors (see below), whose sum is σ = 49116816. Its totient is φ = 7016680.

The previous prime is 21050033. The next prime is 21050053. The reversal of 21050052 is 25005012.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (21050053) 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, 877074 + ... + 877097.

It is an arithmetic number, because the mean of its divisors is an integer number (4093068).

Almost surely, 2^21050052 is an apocalyptic number.

It is an amenable number.

21050052 is an abundant number, since it is smaller than the sum of its proper divisors (28066764).

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

21050052 is a wasteful number, since it uses less digits than its factorization.

21050052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1754178 (or 1754176 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 15.

The square root of 21050052 is about 4588.0335657011. The cubic root of 21050052 is about 276.1114336841. Note that the first 3 decimals are identical.

Adding to 21050052 its reverse (25005012), we get a palindrome (46055064).

The spelling of 21050052 in words is "twenty-one million, fifty thousand, fifty-two".