21299192 has 8 divisors (see below), whose sum is σ = 39936000. Its totient is φ = 10649592.

The previous prime is 21299167. The next prime is 21299221. The reversal of 21299192 is 29199212.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1331192 + ... + 1331207.

It is an arithmetic number, because the mean of its divisors is an integer number (4992000).

Almost surely, 2^21299192 is an apocalyptic number.

It is an amenable number.

21299192 is a deficient number, since it is larger than the sum of its proper divisors (18636808).

21299192 is a wasteful number, since it uses less digits than its factorization.

21299192 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2662405 (or 2662401 counting only the distinct ones).

The product of its digits is 5832, while the sum is 35.

The square root of 21299192 is about 4615.1047658748. The cubic root of 21299192 is about 277.1964790040.

The spelling of 21299192 in words is "twenty-one million, two hundred ninety-nine thousand, one hundred ninety-two".