21027450 has 48 divisors (see below), whose sum is σ = 52693056. Its totient is φ = 5548800.

The previous prime is 21027449. The next prime is 21027463. The reversal of 21027450 is 5472012.

21027450 is nontrivially palindromic in base 7.

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, 14770 + ... + 16130.

It is an arithmetic number, because the mean of its divisors is an integer number (1097772).

Almost surely, 2^21027450 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21027450, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26346528).

21027450 is an abundant number, since it is smaller than the sum of its proper divisors (31665606).

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

21027450 is a wasteful number, since it uses less digits than its factorization.

21027450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1479 (or 1474 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 21.

The square root of 21027450 is about 4585.5697574020. The cubic root of 21027450 is about 276.0125755665.

Adding to 21027450 its reverse (5472012), we get a palindrome (26499462).

The spelling of 21027450 in words is "twenty-one million, twenty-seven thousand, four hundred fifty".