21300761 has 8 divisors (see below), whose sum is σ = 22152000. Its totient is φ = 20457360.

The previous prime is 21300757. The next prime is 21300791. The reversal of 21300761 is 16700312.

It is a happy number.

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 21300761 - 2² = 21300757 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21300791) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3926 + ... + 7616.

It is an arithmetic number, because the mean of its divisors is an integer number (2769000).

Almost surely, 2^21300761 is an apocalyptic number.

It is an amenable number.

21300761 is a deficient number, since it is larger than the sum of its proper divisors (851239).

21300761 is a wasteful number, since it uses less digits than its factorization.

21300761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3919.

The product of its (nonzero) digits is 252, while the sum is 20.

The square root of 21300761 is about 4615.2747480513. The cubic root of 21300761 is about 277.2032853748.

The spelling of 21300761 in words is "twenty-one million, three hundred thousand, seven hundred sixty-one".