21024069 has 16 divisors (see below), whose sum is σ = 30748224. Its totient is φ = 12672000.

The previous prime is 21024067. The next prime is 21024083. The reversal of 21024069 is 96042012.

It is not a de Polignac number, because 21024069 - 2¹ = 21024067 is a prime.

It is a super-2 number, since 2×21024069² = 884022954633522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21024067) 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, 4719 + ... + 8019.

It is an arithmetic number, because the mean of its divisors is an integer number (1921764).

Almost surely, 2^21024069 is an apocalyptic number.

It is an amenable number.

21024069 is a deficient number, since it is larger than the sum of its proper divisors (9724155).

21024069 is a wasteful number, since it uses less digits than its factorization.

21024069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3508.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 21024069 is about 4585.2010861030. The cubic root of 21024069 is about 275.9977814356.

The spelling of 21024069 in words is "twenty-one million, twenty-four thousand, sixty-nine".