21024196 has 6 divisors (see below), whose sum is σ = 36792350. Its totient is φ = 10512096.

The previous prime is 21024193. The next prime is 21024197. The reversal of 21024196 is 69142012.

It can be written as a sum of positive squares in only one way, i.e., 20575296 + 448900 = 4536^2 + 670^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21024196.

It is not an unprimeable number, because it can be changed into a prime (21024193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2628021 + ... + 2628028.

Almost surely, 2^21024196 is an apocalyptic number.

It is an amenable number.

21024196 is a deficient number, since it is larger than the sum of its proper divisors (15768154).

21024196 is a wasteful number, since it uses less digits than its factorization.

21024196 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5256053 (or 5256051 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 21024196 is about 4585.2149349840. The cubic root of 21024196 is about 275.9983371740.

The spelling of 21024196 in words is "twenty-one million, twenty-four thousand, one hundred ninety-six".