21192205 has 8 divisors (see below), whose sum is σ = 25461504. Its totient is φ = 16933200.

The previous prime is 21192173. The next prime is 21192211. The reversal of 21192205 is 50229112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21192205 - 2⁵ = 21192173 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3100 + ... + 7210.

It is an arithmetic number, because the mean of its divisors is an integer number (3182688).

Almost surely, 2^21192205 is an apocalyptic number.

It is an amenable number.

21192205 is a deficient number, since it is larger than the sum of its proper divisors (4269299).

21192205 is a wasteful number, since it uses less digits than its factorization.

21192205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5147.

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 21192205 is about 4603.4992125556. The cubic root of 21192205 is about 276.7315753901.

It can be divided in two parts, 211 and 92205, that added together give a square (92416 = 304²).

The spelling of 21192205 in words is "twenty-one million, one hundred ninety-two thousand, two hundred five".