21449020 has 24 divisors (see below), whose sum is σ = 45460800. Its totient is φ = 8500032.

The previous prime is 21448961. The next prime is 21449083. The reversal of 21449020 is 2094412.

It is a junction number, because it is equal to n+sod(n) for n = 21448982 and 21449000.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2740 + ... + 7099.

It is an arithmetic number, because the mean of its divisors is an integer number (1894200).

Almost surely, 2^21449020 is an apocalyptic number.

21449020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21449020 is an abundant number, since it is smaller than the sum of its proper divisors (24011780).

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

21449020 is a wasteful number, since it uses less digits than its factorization.

21449020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9957 (or 9955 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 21449020 is about 4631.3086703436. The cubic root of 21449020 is about 277.8449353474.

The spelling of 21449020 in words is "twenty-one million, four hundred forty-nine thousand, twenty".