21135769 has 8 divisors (see below), whose sum is σ = 22408448. Its totient is φ = 19900080.

The previous prime is 21135767. The next prime is 21135773. The reversal of 21135769 is 96753112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21135769 - 2¹ = 21135767 is a prime.

It is a super-2 number, since 2×21135769² = 893441462442722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21135761) 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, 8067 + ... + 10360.

It is an arithmetic number, because the mean of its divisors is an integer number (2801056).

Almost surely, 2^21135769 is an apocalyptic number.

It is an amenable number.

21135769 is a deficient number, since it is larger than the sum of its proper divisors (1272679).

21135769 is a wasteful number, since it uses less digits than its factorization.

21135769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18495.

The product of its digits is 11340, while the sum is 34.

The square root of 21135769 is about 4597.3654412065. The cubic root of 21135769 is about 276.4857065708.

It can be divided in two parts, 21135 and 769, that added together give a square (21904 = 148²).

The spelling of 21135769 in words is "twenty-one million, one hundred thirty-five thousand, seven hundred sixty-nine".