21140013 has 8 divisors (see below), whose sum is σ = 29412288. Its totient is φ = 13480544.

The previous prime is 21140011. The next prime is 21140033. The reversal of 21140013 is 31004112.

It is a happy number.

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 21140013 - 2¹ = 21140011 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21140011) 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, 153120 + ... + 153257.

It is an arithmetic number, because the mean of its divisors is an integer number (3676536).

Almost surely, 2^21140013 is an apocalyptic number.

21140013 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21140013 is a deficient number, since it is larger than the sum of its proper divisors (8272275).

21140013 is a wasteful number, since it uses less digits than its factorization.

21140013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 306403.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 21140013 is about 4597.8269867406. The cubic root of 21140013 is about 276.5042111701.

Adding to 21140013 its reverse (31004112), we get a palindrome (52144125).

The spelling of 21140013 in words is "twenty-one million, one hundred forty thousand, thirteen".