21020243231413 has 64 divisors (see below), whose sum is σ = 23542513920000. Its totient is φ = 18686719699200.

The previous prime is 21020243231363. The next prime is 21020243231443. The reversal of 21020243231413 is 31413234202012.

It is not a de Polignac number, because 21020243231413 - 2⁹ = 21020243230901 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21020243231443) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2426434920 + ... + 2426443582.

It is an arithmetic number, because the mean of its divisors is an integer number (367851780000).

Almost surely, 2^{21020243231413} is an apocalyptic number.

It is an amenable number.

21020243231413 is a deficient number, since it is larger than the sum of its proper divisors (2522270688587).

21020243231413 is a wasteful number, since it uses less digits than its factorization.

21020243231413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9610.

The product of its (nonzero) digits is 6912, while the sum is 28.

Adding to 21020243231413 its reverse (31413234202012), we get a palindrome (52433477433425).

The spelling of 21020243231413 in words is "twenty-one trillion, twenty billion, two hundred forty-three million, two hundred thirty-one thousand, four hundred thirteen".