21874628 has 12 divisors (see below), whose sum is σ = 38450832. Its totient is φ = 10888680.

The previous prime is 21874627. The next prime is 21874673. The reversal of 21874628 is 82647812.

It is a junction number, because it is equal to n+sod(n) for n = 21874591 and 21874600.

It is not an unprimeable number, because it can be changed into a prime (21874621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11138 + ... + 12953.

It is an arithmetic number, because the mean of its divisors is an integer number (3204236).

Almost surely, 2^21874628 is an apocalyptic number.

It is an amenable number.

21874628 is a deficient number, since it is larger than the sum of its proper divisors (16576204).

21874628 is a wasteful number, since it uses less digits than its factorization.

21874628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24322 (or 24320 counting only the distinct ones).

The product of its digits is 43008, while the sum is 38.

The square root of 21874628 is about 4677.0319648256. The cubic root of 21874628 is about 279.6706501693.

The spelling of 21874628 in words is "twenty-one million, eight hundred seventy-four thousand, six hundred twenty-eight".