21113450 has 24 divisors (see below), whose sum is σ = 40627980. Its totient is φ = 8153600.

The previous prime is 21113447. The next prime is 21113459. The reversal of 21113450 is 5431112.

It can be written as a sum of positive squares in 6 ways, for example, as 12581209 + 8532241 = 3547^2 + 2921^2 .

It is not an unprimeable number, because it can be changed into a prime (21113459) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5831 + ... + 8730.

Almost surely, 2^21113450 is an apocalyptic number.

21113450 is a deficient number, since it is larger than the sum of its proper divisors (19514530).

21113450 is a wasteful number, since it uses less digits than its factorization.

21113450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14602 (or 14597 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 21113450 is about 4594.9374315653. The cubic root of 21113450 is about 276.3883509478.

Adding to 21113450 its reverse (5431112), we get a palindrome (26544562).

The spelling of 21113450 in words is "twenty-one million, one hundred thirteen thousand, four hundred fifty".