21775193 has 4 divisors (see below), whose sum is σ = 23754768. Its totient is φ = 19795620.

The previous prime is 21775183. The next prime is 21775199. The reversal of 21775193 is 39157712.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21775193 - 2¹² = 21771097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21775199) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 989771 + ... + 989792.

It is an arithmetic number, because the mean of its divisors is an integer number (5938692).

Almost surely, 2^21775193 is an apocalyptic number.

It is an amenable number.

21775193 is a deficient number, since it is larger than the sum of its proper divisors (1979575).

21775193 is a wasteful number, since it uses less digits than its factorization.

21775193 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1979574.

The product of its digits is 13230, while the sum is 35.

The square root of 21775193 is about 4666.3897179726. The cubic root of 21775193 is about 279.2462422689.

The spelling of 21775193 in words is "twenty-one million, seven hundred seventy-five thousand, one hundred ninety-three".