21069045 has 32 divisors (see below), whose sum is σ = 37670400. Its totient is φ = 11172672.

The previous prime is 21069031. The next prime is 21069073. The reversal of 21069045 is 54096012.

It is not a de Polignac number, because 21069045 - 2⁹ = 21068533 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 31939 + ... + 32591.

It is an arithmetic number, because the mean of its divisors is an integer number (1177200).

Almost surely, 2^21069045 is an apocalyptic number.

It is an amenable number.

21069045 is a deficient number, since it is larger than the sum of its proper divisors (16601355).

21069045 is a wasteful number, since it uses less digits than its factorization.

21069045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 906 (or 900 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 21069045 is about 4590.1029400222. The cubic root of 21069045 is about 276.1944518165.

The spelling of 21069045 in words is "twenty-one million, sixty-nine thousand, forty-five".