21224010 has 16 divisors (see below), whose sum is σ = 50937696. Its totient is φ = 5659728.

The previous prime is 21224003. The next prime is 21224023. The reversal of 21224010 is 1042212.

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, 353704 + ... + 353763.

It is an arithmetic number, because the mean of its divisors is an integer number (3183606).

Almost surely, 2^21224010 is an apocalyptic number.

21224010 is an abundant number, since it is smaller than the sum of its proper divisors (29713686).

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

21224010 is a wasteful number, since it uses less digits than its factorization.

21224010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 707477.

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 21224010 is about 4606.9523548654. The cubic root of 21224010 is about 276.8699446378.

Adding to 21224010 its reverse (1042212), we get a palindrome (22266222).

The spelling of 21224010 in words is "twenty-one million, two hundred twenty-four thousand, ten".