21053450 has 48 divisors (see below), whose sum is σ = 43256160. Its totient is φ = 7560000.

The previous prime is 21053437. The next prime is 21053467. The reversal of 21053450 is 5435012.

It is a Curzon number.

It is a zygodrome in base 4.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 55361 + ... + 55739.

It is an arithmetic number, because the mean of its divisors is an integer number (901170).

Almost surely, 2^21053450 is an apocalyptic number.

21053450 is an abundant number, since it is smaller than the sum of its proper divisors (22202710).

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

21053450 is a wasteful number, since it uses less digits than its factorization.

21053450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 503 (or 498 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 21053450 is about 4588.4038619110. The cubic root of 21053450 is about 276.1262899605.

Adding to 21053450 its reverse (5435012), we get a palindrome (26488462).

It can be divided in two parts, 2105 and 3450, that added together give a palindrome (5555).

The spelling of 21053450 in words is "twenty-one million, fifty-three thousand, four hundred fifty".