21024435969 has 12 divisors (see below), whose sum is σ = 30445130196. Its totient is φ = 13980982752.

The previous prime is 21024435967. The next prime is 21024435973. The reversal of 21024435969 is 96953442012.

21024435969 is a `hidden beast` number, since 2 + 10 + 2 + 4 + 43 + 596 + 9 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 9694962369 + 11329473600 = 98463^2 + 106440^2 .

It is not a de Polignac number, because 21024435969 - 2¹ = 21024435967 is a prime.

It is a super-2 number, since 2×21024435969² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21024435967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2938554 + ... + 2945699.

It is an arithmetic number, because the mean of its divisors is an integer number (2537094183).

Almost surely, 2^21024435969 is an apocalyptic number.

It is an amenable number.

21024435969 is a deficient number, since it is larger than the sum of its proper divisors (9420694227).

21024435969 is a wasteful number, since it uses less digits than its factorization.

21024435969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5884656 (or 5884653 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 45.

The spelling of 21024435969 in words is "twenty-one billion, twenty-four million, four hundred thirty-five thousand, nine hundred sixty-nine".