21269061 has 48 divisors (see below), whose sum is σ = 35555520. Its totient is φ = 12597120.

The previous prime is 21269033. The next prime is 21269077. The reversal of 21269061 is 16096212.

It is not a de Polignac number, because 21269061 - 2¹⁴ = 21252677 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21269161) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 195075 + ... + 195183.

It is an arithmetic number, because the mean of its divisors is an integer number (740740).

Almost surely, 2^21269061 is an apocalyptic number.

It is an amenable number.

21269061 is a deficient number, since it is larger than the sum of its proper divisors (14286459).

21269061 is a wasteful number, since it uses less digits than its factorization.

21269061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208 (or 196 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 21269061 is about 4611.8392209616. The cubic root of 21269061 is about 277.0657048929.

The spelling of 21269061 in words is "twenty-one million, two hundred sixty-nine thousand, sixty-one".