21021232030313 has 4 divisors (see below), whose sum is σ = 21021252328260. Its totient is φ = 21021211732368.

The previous prime is 21021232030307. The next prime is 21021232030343. The reversal of 21021232030313 is 31303023212012.

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 2225816334889 + 18795415695424 = 1491917^2 + 4335368^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21021232030313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21021232030343) 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, 8506970 + ... + 10696307.

It is an arithmetic number, because the mean of its divisors is an integer number (5255313082065).

Almost surely, 2^{21021232030313} is an apocalyptic number.

It is an amenable number.

21021232030313 is a deficient number, since it is larger than the sum of its proper divisors (20297947).

21021232030313 is a wasteful number, since it uses less digits than its factorization.

21021232030313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20297946.

The product of its (nonzero) digits is 1296, while the sum is 23.

Adding to 21021232030313 its reverse (31303023212012), we get a palindrome (52324255242325).

The spelling of 21021232030313 in words is "twenty-one trillion, twenty-one billion, two hundred thirty-two million, thirty thousand, three hundred thirteen".