21299045 has 16 divisors (see below), whose sum is σ = 27397440. Its totient is φ = 15838464.

The previous prime is 21299041. The next prime is 21299051. The reversal of 21299045 is 54099212.

It is a cyclic number.

It is not a de Polignac number, because 21299045 - 2² = 21299041 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21299041) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5546 + ... + 8564.

It is an arithmetic number, because the mean of its divisors is an integer number (1712340).

Almost surely, 2^21299045 is an apocalyptic number.

It is an amenable number.

21299045 is a deficient number, since it is larger than the sum of its proper divisors (6098395).

21299045 is a wasteful number, since it uses less digits than its factorization.

21299045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3124.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 21299045 is about 4615.0888398816. The cubic root of 21299045 is about 277.1958412963.

The spelling of 21299045 in words is "twenty-one million, two hundred ninety-nine thousand, forty-five".