21046049 has 8 divisors (see below), whose sum is σ = 21628992. Its totient is φ = 20467440.

The previous prime is 21046027. The next prime is 21046073. The reversal of 21046049 is 94064012.

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 21046049 - 2¹⁶ = 20980513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21046009) 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, 10379 + ... + 12239.

It is an arithmetic number, because the mean of its divisors is an integer number (2703624).

Almost surely, 2^21046049 is an apocalyptic number.

It is an amenable number.

21046049 is a deficient number, since it is larger than the sum of its proper divisors (582943).

21046049 is a wasteful number, since it uses less digits than its factorization.

21046049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2167.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 21046049 is about 4587.5973014204. The cubic root of 21046049 is about 276.0939302572.

The spelling of 21046049 in words is "twenty-one million, forty-six thousand, forty-nine".