21224030 has 32 divisors (see below), whose sum is σ = 39191040. Its totient is φ = 8273440.

The previous prime is 21224023. The next prime is 21224053. The reversal of 21224030 is 3042212.

21224030 = 45² + 46² + ... + 399².

It is a junction number, because it is equal to n+sod(n) for n = 21223996 and 21224014.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 118481 + ... + 118659.

It is an arithmetic number, because the mean of its divisors is an integer number (1224720).

Almost surely, 2^21224030 is an apocalyptic number.

21224030 is a deficient number, since it is larger than the sum of its proper divisors (17967010).

21224030 is a wasteful number, since it uses less digits than its factorization.

21224030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 424.

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 21224030 is about 4606.9545254973. The cubic root of 21224030 is about 276.8700316053.

Adding to 21224030 its reverse (3042212), we get a palindrome (24266242).

It can be divided in two parts, 212 and 24030, that added together give a palindrome (24242).

The spelling of 21224030 in words is "twenty-one million, two hundred twenty-four thousand, thirty".