21139335 has 36 divisors (see below), whose sum is σ = 42628248. Its totient is φ = 9662688.

The previous prime is 21139301. The next prime is 21139337. The reversal of 21139335 is 53393112.

It is a happy number.

It is not a de Polignac number, because 21139335 - 2⁶ = 21139271 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21139299 and 21139308.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21139337) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 2589 + ... + 6998.

It is an arithmetic number, because the mean of its divisors is an integer number (1184118).

Almost surely, 2^21139335 is an apocalyptic number.

21139335 is an abundant number, since it is smaller than the sum of its proper divisors (21488913).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21139335 is a wasteful number, since it uses less digits than its factorization.

21139335 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9612 (or 9602 counting only the distinct ones).

The product of its digits is 2430, while the sum is 27.

The square root of 21139335 is about 4597.7532556674. The cubic root of 21139335 is about 276.5012551350.

The spelling of 21139335 in words is "twenty-one million, one hundred thirty-nine thousand, three hundred thirty-five".