21484725 has 24 divisors (see below), whose sum is σ = 37393440. Its totient is φ = 10854720.

The previous prime is 21484721. The next prime is 21484747. The reversal of 21484725 is 52748412.

It is not a de Polignac number, because 21484725 - 2² = 21484721 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21484721) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6114 + ... + 8963.

It is an arithmetic number, because the mean of its divisors is an integer number (1558060).

Almost surely, 2^21484725 is an apocalyptic number.

21484725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21484725 is a deficient number, since it is larger than the sum of its proper divisors (15908715).

21484725 is a wasteful number, since it uses less digits than its factorization.

21484725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15109 (or 15104 counting only the distinct ones).

The product of its digits is 17920, while the sum is 33.

The square root of 21484725 is about 4635.1618094733. The cubic root of 21484725 is about 277.9990209237. Note that the first 3 decimals are identical.

The spelling of 21484725 in words is "twenty-one million, four hundred eighty-four thousand, seven hundred twenty-five".