21201131113381 has 2 divisors, whose sum is σ = 21201131113382. Its totient is φ = 21201131113380.

The previous prime is 21201131113271. The next prime is 21201131113397. The reversal of 21201131113381 is 18331113110212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16740650473156 + 4460480640225 = 4091534^2 + 2111985^2 .

It is a cyclic number.

It is not a de Polignac number, because 21201131113381 - 2²³ = 21201122724773 is a prime.

It is a super-2 number, since 2×21201131113381² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21201131113181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10600565556690 + 10600565556691.

It is an arithmetic number, because the mean of its divisors is an integer number (10600565556691).

Almost surely, 2^{21201131113381} is an apocalyptic number.

It is an amenable number.

21201131113381 is a deficient number, since it is larger than the sum of its proper divisors (1).

21201131113381 is an equidigital number, since it uses as much as digits as its factorization.

21201131113381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 28.

Adding to 21201131113381 its reverse (18331113110212), we get a palindrome (39532244223593).

The spelling of 21201131113381 in words is "twenty-one trillion, two hundred one billion, one hundred thirty-one million, one hundred thirteen thousand, three hundred eighty-one".