21040144013 has 16 divisors (see below), whose sum is σ = 25120628736. Its totient is φ = 17242366320.

The previous prime is 21040144007. The next prime is 21040144031. The reversal of 21040144013 is 31044104012.

It is a cyclic number.

It is not a de Polignac number, because 21040144013 - 2²² = 21035949709 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21040144043) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 566081 + ... + 602102.

It is an arithmetic number, because the mean of its divisors is an integer number (1570039296).

Almost surely, 2^21040144013 is an apocalyptic number.

It is an amenable number.

21040144013 is a deficient number, since it is larger than the sum of its proper divisors (4080484723).

21040144013 is a wasteful number, since it uses less digits than its factorization.

21040144013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1168304.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 21040144013 its reverse (31044104012), we get a palindrome (52084248025).

The spelling of 21040144013 in words is "twenty-one billion, forty million, one hundred forty-four thousand, thirteen".