21002193 has 8 divisors (see below), whose sum is σ = 31114400. Its totient is φ = 14001444.

The previous prime is 21002129. The next prime is 21002203. The reversal of 21002193 is 39120012.

It is a happy number.

It is not a de Polignac number, because 21002193 - 2⁶ = 21002129 is a prime.

It is a super-2 number, since 2×21002193² = 882184221618498, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21002393) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 388903 + ... + 388956.

It is an arithmetic number, because the mean of its divisors is an integer number (3889300).

Almost surely, 2^21002193 is an apocalyptic number.

It is an amenable number.

21002193 is a deficient number, since it is larger than the sum of its proper divisors (10112207).

21002193 is an equidigital number, since it uses as much as digits as its factorization.

21002193 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 777868 (or 777862 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

The square root of 21002193 is about 4582.8149646260. The cubic root of 21002193 is about 275.9020209875.

The spelling of 21002193 in words is "twenty-one million, two thousand, one hundred ninety-three".