21512050 has 24 divisors (see below), whose sum is σ = 45729216. Its totient is φ = 7375440.

The previous prime is 21512033. The next prime is 21512053. The reversal of 21512050 is 5021512.

It is not an unprimeable number, because it can be changed into a prime (21512053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30382 + ... + 31081.

It is an arithmetic number, because the mean of its divisors is an integer number (1905384).

Almost surely, 2^21512050 is an apocalyptic number.

21512050 is an abundant number, since it is smaller than the sum of its proper divisors (24217166).

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

21512050 is a wasteful number, since it uses less digits than its factorization.

21512050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61482 (or 61477 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 16.

The square root of 21512050 is about 4638.1084506510. The cubic root of 21512050 is about 278.1168271806.

Adding to 21512050 its reverse (5021512), we get a palindrome (26533562).

The spelling of 21512050 in words is "twenty-one million, five hundred twelve thousand, fifty".