21628196 has 6 divisors (see below), whose sum is σ = 37849350. Its totient is φ = 10814096.

The previous prime is 21628193. The next prime is 21628219. The reversal of 21628196 is 69182612.

It can be written as a sum of positive squares in only one way, i.e., 21529600 + 98596 = 4640^2 + 314^2 .

It is not an unprimeable number, because it can be changed into a prime (21628193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2703521 + ... + 2703528.

It is an arithmetic number, because the mean of its divisors is an integer number (6308225).

Almost surely, 2^21628196 is an apocalyptic number.

It is an amenable number.

21628196 is a deficient number, since it is larger than the sum of its proper divisors (16221154).

21628196 is a wasteful number, since it uses less digits than its factorization.

21628196 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5407053 (or 5407051 counting only the distinct ones).

The product of its digits is 10368, while the sum is 35.

The square root of 21628196 is about 4650.6124327878. The cubic root of 21628196 is about 278.6164571775.

The spelling of 21628196 in words is "twenty-one million, six hundred twenty-eight thousand, one hundred ninety-six".