21195773 has 4 divisors (see below), whose sum is σ = 22311360. Its totient is φ = 20080188.

The previous prime is 21195767. The next prime is 21195791. The reversal of 21195773 is 37759112.

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 not a de Polignac number, because 21195773 - 2¹⁸ = 20933629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21194773) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 557765 + ... + 557802.

It is an arithmetic number, because the mean of its divisors is an integer number (5577840).

Almost surely, 2^21195773 is an apocalyptic number.

It is an amenable number.

21195773 is a deficient number, since it is larger than the sum of its proper divisors (1115587).

21195773 is a wasteful number, since it uses less digits than its factorization.

21195773 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1115586.

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

The square root of 21195773 is about 4603.8867275379. The cubic root of 21195773 is about 276.7471050444.

The spelling of 21195773 in words is "twenty-one million, one hundred ninety-five thousand, seven hundred seventy-three".