21140043413 has 2 divisors, whose sum is σ = 21140043414. Its totient is φ = 21140043412.

The previous prime is 21140043409. The next prime is 21140043469. The reversal of 21140043413 is 31434004112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17540883364 + 3599160049 = 132442^2 + 59993^2 .

It is a cyclic number.

It is not a de Polignac number, because 21140043413 - 2² = 21140043409 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21140043403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10570021706 + 10570021707.

It is an arithmetic number, because the mean of its divisors is an integer number (10570021707).

Almost surely, 2^21140043413 is an apocalyptic number.

It is an amenable number.

21140043413 is a deficient number, since it is larger than the sum of its proper divisors (1).

21140043413 is an equidigital number, since it uses as much as digits as its factorization.

21140043413 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 21140043413 its reverse (31434004112), we get a palindrome (52574047525).

The spelling of 21140043413 in words is "twenty-one billion, one hundred forty million, forty-three thousand, four hundred thirteen".