21041015020413 has 4 divisors (see below), whose sum is σ = 28054686693888. Its totient is φ = 14027343346940.

The previous prime is 21041015020309. The next prime is 21041015020429. The reversal of 21041015020413 is 31402051014012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21041015020413 - 2²² = 21041010826109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21041015020213) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3506835836733 + ... + 3506835836738.

It is an arithmetic number, because the mean of its divisors is an integer number (7013671673472).

Almost surely, 2^{21041015020413} is an apocalyptic number.

It is an amenable number.

21041015020413 is a deficient number, since it is larger than the sum of its proper divisors (7013671673475).

21041015020413 is an equidigital number, since it uses as much as digits as its factorization.

21041015020413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7013671673474.

The product of its (nonzero) digits is 960, while the sum is 24.

Adding to 21041015020413 its reverse (31402051014012), we get a palindrome (52443066034425).

The spelling of 21041015020413 in words is "twenty-one trillion, forty-one billion, fifteen million, twenty thousand, four hundred thirteen".