21094761 has 8 divisors (see below), whose sum is σ = 28202080. Its totient is φ = 14025312.

The previous prime is 21094747. The next prime is 21094771. The reversal of 21094761 is 16749012.

It is a happy number.

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

It is not a de Polignac number, because 21094761 - 2¹¹ = 21092713 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21094721) 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, 8140 + ... + 10413.

It is an arithmetic number, because the mean of its divisors is an integer number (3525260).

Almost surely, 2^21094761 is an apocalyptic number.

It is an amenable number.

21094761 is a deficient number, since it is larger than the sum of its proper divisors (7107319).

21094761 is a wasteful number, since it uses less digits than its factorization.

21094761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18935.

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 21094761 is about 4592.9033301388. The cubic root of 21094761 is about 276.3067766159.

The spelling of 21094761 in words is "twenty-one million, ninety-four thousand, seven hundred sixty-one".