21146013 has 24 divisors (see below), whose sum is σ = 35505600. Its totient is φ = 11876544.

The previous prime is 21145991. The next prime is 21146023. The reversal of 21146013 is 31064112.

It is a happy number.

It is not a de Polignac number, because 21146013 - 2⁸ = 21145757 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21146023) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 873 + ... + 6561.

It is an arithmetic number, because the mean of its divisors is an integer number (1479400).

Almost surely, 2^21146013 is an apocalyptic number.

It is an amenable number.

21146013 is a deficient number, since it is larger than the sum of its proper divisors (14359587).

21146013 is a wasteful number, since it uses less digits than its factorization.

21146013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5761 (or 5758 counting only the distinct ones).

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

The square root of 21146013 is about 4598.4794225918. The cubic root of 21146013 is about 276.5303680184.

The spelling of 21146013 in words is "twenty-one million, one hundred forty-six thousand, thirteen".