21199877 has 8 divisors (see below), whose sum is σ = 23036160. Its totient is φ = 19435680.

The previous prime is 21199873. The next prime is 21199891. The reversal of 21199877 is 77899112.

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

It is a cyclic number.

It is not a de Polignac number, because 21199877 - 2² = 21199873 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 (21199873) 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 7 ways as a sum of consecutive naturals, for example, 17408 + ... + 18585.

It is an arithmetic number, because the mean of its divisors is an integer number (2879520).

Almost surely, 2^21199877 is an apocalyptic number.

It is an amenable number.

21199877 is a deficient number, since it is larger than the sum of its proper divisors (1836283).

21199877 is a wasteful number, since it uses less digits than its factorization.

21199877 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36043.

The product of its digits is 63504, while the sum is 44.

The square root of 21199877 is about 4604.3324163227. The cubic root of 21199877 is about 276.7649654738.

The spelling of 21199877 in words is "twenty-one million, one hundred ninety-nine thousand, eight hundred seventy-seven".