21034450 has 24 divisors (see below), whose sum is σ = 39536532. Its totient is φ = 8325120.

The previous prime is 21034421. The next prime is 21034471. The reversal of 21034450 is 5443012.

It can be written as a sum of positive squares in 6 ways, for example, as 1595169 + 19439281 = 1263^2 + 4409^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2682 + ... + 7018.

Almost surely, 2^21034450 is an apocalyptic number.

21034450 is a deficient number, since it is larger than the sum of its proper divisors (18502082).

21034450 is a wasteful number, since it uses less digits than its factorization.

21034450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4446 (or 4441 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 21034450 is about 4586.3329578215. The cubic root of 21034450 is about 276.0432001972.

Adding to 21034450 its reverse (5443012), we get a palindrome (26477462).

The spelling of 21034450 in words is "twenty-one million, thirty-four thousand, four hundred fifty".