21046311 has 80 divisors (see below), whose sum is σ = 39029760. Its totient is φ = 11119680.

The previous prime is 21046309. The next prime is 21046327. The reversal of 21046311 is 11364012.

It is a happy number.

It is not a de Polignac number, because 21046311 - 2¹ = 21046309 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21046301) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 266370 + ... + 266448.

It is an arithmetic number, because the mean of its divisors is an integer number (487872).

Almost surely, 2^21046311 is an apocalyptic number.

21046311 is a deficient number, since it is larger than the sum of its proper divisors (17983449).

21046311 is a wasteful number, since it uses less digits than its factorization.

21046311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138 (or 129 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 21046311 is about 4587.6258565842. The cubic root of 21046311 is about 276.0950759403.

The spelling of 21046311 in words is "twenty-one million, forty-six thousand, three hundred eleven".