21049049 has 8 divisors (see below), whose sum is σ = 24346560. Its totient is φ = 17824176.

The previous prime is 21049027. The next prime is 21049103. The reversal of 21049049 is 94094012.

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 21049049 - 2⁸ = 21048793 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21049019) 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, 17534 + ... + 18695.

It is an arithmetic number, because the mean of its divisors is an integer number (3043320).

Almost surely, 2^21049049 is an apocalyptic number.

It is an amenable number.

21049049 is a deficient number, since it is larger than the sum of its proper divisors (3297511).

21049049 is an equidigital number, since it uses as much as digits as its factorization.

21049049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36319.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 21049049 is about 4587.9242583112. The cubic root of 21049049 is about 276.1070481974.

The spelling of 21049049 in words is "twenty-one million, forty-nine thousand, forty-nine".