21193353 has 8 divisors (see below), whose sum is σ = 31397600. Its totient is φ = 14128884.

The previous prime is 21193343. The next prime is 21193357. The reversal of 21193353 is 35339112.

It is a happy number.

It is not a de Polignac number, because 21193353 - 2⁵ = 21193321 is a prime.

It is a super-2 number, since 2×21193353² = 898316422765218, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 784939 = 21193353 / (2 + 1 + 1 + 9 + 3 + 3 + 5 + 3).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21193357) 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, 392443 + ... + 392496.

It is an arithmetic number, because the mean of its divisors is an integer number (3924700).

Almost surely, 2^21193353 is an apocalyptic number.

It is an amenable number.

21193353 is a deficient number, since it is larger than the sum of its proper divisors (10204247).

21193353 is an equidigital number, since it uses as much as digits as its factorization.

21193353 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 784948 (or 784942 counting only the distinct ones).

The product of its digits is 2430, while the sum is 27.

The square root of 21193353 is about 4603.6238986260. The cubic root of 21193353 is about 276.7365722291.

The spelling of 21193353 in words is "twenty-one million, one hundred ninety-three thousand, three hundred fifty-three".