21010769 has 8 divisors (see below), whose sum is σ = 22710912. Its totient is φ = 19322640.

The previous prime is 21010763. The next prime is 21010811. The reversal of 21010769 is 96701012.

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 21010769 - 2¹² = 21006673 is a prime.

It is a super-3 number, since 3×21010769³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21010763) 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, 824 + ... + 6534.

It is an arithmetic number, because the mean of its divisors is an integer number (2838864).

Almost surely, 2^21010769 is an apocalyptic number.

It is an amenable number.

21010769 is a deficient number, since it is larger than the sum of its proper divisors (1700143).

21010769 is a wasteful number, since it uses less digits than its factorization.

21010769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6007.

The product of its (nonzero) digits is 756, while the sum is 26.

The square root of 21010769 is about 4583.7505385874. The cubic root of 21010769 is about 275.9395696655.

The spelling of 21010769 in words is "twenty-one million, ten thousand, seven hundred sixty-nine".