21199377 has 8 divisors (see below), whose sum is σ = 29240640. Its totient is φ = 13645520.

The previous prime is 21199369. The next prime is 21199411. The reversal of 21199377 is 77399112.

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 21199377 - 2³ = 21199369 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21199327) 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, 121749 + ... + 121922.

It is an arithmetic number, because the mean of its divisors is an integer number (3655080).

Almost surely, 2^21199377 is an apocalyptic number.

It is an amenable number.

21199377 is a deficient number, since it is larger than the sum of its proper divisors (8041263).

21199377 is a wasteful number, since it uses less digits than its factorization.

21199377 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243703.

The product of its digits is 23814, while the sum is 39.

The square root of 21199377 is about 4604.2781193147. The cubic root of 21199377 is about 276.7627896189.

The spelling of 21199377 in words is "twenty-one million, one hundred ninety-nine thousand, three hundred seventy-seven".