21011269 has 8 divisors (see below), whose sum is σ = 22457088. Its totient is φ = 19588800.

The previous prime is 21011251. The next prime is 21011293. The reversal of 21011269 is 96211012.

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 21011269 - 2⁷ = 21011141 is a prime.

It is a super-2 number, since 2×21011269² = 882946849980722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21011239) 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, 3957 + ... + 7594.

It is an arithmetic number, because the mean of its divisors is an integer number (2807136).

Almost surely, 2^21011269 is an apocalyptic number.

It is an amenable number.

21011269 is a deficient number, since it is larger than the sum of its proper divisors (1445819).

21011269 is a wasteful number, since it uses less digits than its factorization.

21011269 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11675.

The product of its (nonzero) digits is 216, while the sum is 22.

The square root of 21011269 is about 4583.8050787528. The cubic root of 21011269 is about 275.9417585222.

The spelling of 21011269 in words is "twenty-one million, eleven thousand, two hundred sixty-nine".