21413241232021 has 4 divisors (see below), whose sum is σ = 22672843657452. Its totient is φ = 20153638806592.

The previous prime is 21413241232007. The next prime is 21413241232057. The reversal of 21413241232021 is 12023214231412.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8758936202500 + 12654305029521 = 2959550^2 + 3557289^2 .

It is a cyclic number.

It is not a de Polignac number, because 21413241232021 - 2¹¹ = 21413241229973 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21413241232091) 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, 629801212690 + ... + 629801212723.

It is an arithmetic number, because the mean of its divisors is an integer number (5668210914363).

Almost surely, 2^{21413241232021} is an apocalyptic number.

It is an amenable number.

21413241232021 is a deficient number, since it is larger than the sum of its proper divisors (1259602425431).

21413241232021 is a wasteful number, since it uses less digits than its factorization.

21413241232021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1259602425430.

The product of its (nonzero) digits is 4608, while the sum is 28.

Adding to 21413241232021 its reverse (12023214231412), we get a palindrome (33436455463433).

The spelling of 21413241232021 in words is "twenty-one trillion, four hundred thirteen billion, two hundred forty-one million, two hundred thirty-two thousand, twenty-one".