21573035 has 16 divisors (see below), whose sum is σ = 29007072. Its totient is φ = 15264000.

The previous prime is 21573031. The next prime is 21573049. The reversal of 21573035 is 53037512.

It is not a de Polignac number, because 21573035 - 2² = 21573031 is a prime.

It is a super-2 number, since 2×21573035² = 930791678222450, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21572995 and 21573013.

It is not an unprimeable number, because it can be changed into a prime (21573031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3266 + ... + 7335.

It is an arithmetic number, because the mean of its divisors is an integer number (1812942).

Almost surely, 2^21573035 is an apocalyptic number.

21573035 is a deficient number, since it is larger than the sum of its proper divisors (7434037).

21573035 is a wasteful number, since it uses less digits than its factorization.

21573035 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10654.

The product of its (nonzero) digits is 3150, while the sum is 26.

The square root of 21573035 is about 4644.6781373955. The cubic root of 21573035 is about 278.3793924597.

The spelling of 21573035 in words is "twenty-one million, five hundred seventy-three thousand, thirty-five".