21553049 has 8 divisors (see below), whose sum is σ = 25928640. Its totient is φ = 17501616.

The previous prime is 21553039. The next prime is 21553057. The reversal of 21553049 is 94035512.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21553049 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 (21553009) 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, 80894 + ... + 81159.

It is an arithmetic number, because the mean of its divisors is an integer number (3241080).

Almost surely, 2^21553049 is an apocalyptic number.

It is an amenable number.

21553049 is a deficient number, since it is larger than the sum of its proper divisors (4375591).

21553049 is a wasteful number, since it uses less digits than its factorization.

21553049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162079.

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 21553049 is about 4642.5261442452. The cubic root of 21553049 is about 278.2933991575.

The spelling of 21553049 in words is "twenty-one million, five hundred fifty-three thousand, forty-nine".