21549077 has 8 divisors (see below), whose sum is σ = 24008832. Its totient is φ = 19172800.

The previous prime is 21549071. The next prime is 21549079. The reversal of 21549077 is 77094512.

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 21549077 - 2¹⁸ = 21286933 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 (21549071) 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, 20324 + ... + 21357.

It is an arithmetic number, because the mean of its divisors is an integer number (3001104).

Almost surely, 2^21549077 is an apocalyptic number.

It is an amenable number.

21549077 is a deficient number, since it is larger than the sum of its proper divisors (2459755).

21549077 is a wasteful number, since it uses less digits than its factorization.

21549077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41739.

The product of its (nonzero) digits is 17640, while the sum is 35.

The square root of 21549077 is about 4642.0983401906. The cubic root of 21549077 is about 278.2763025928.

The spelling of 21549077 in words is "twenty-one million, five hundred forty-nine thousand, seventy-seven".