21401113387 has 2 divisors, whose sum is σ = 21401113388. Its totient is φ = 21401113386.

The previous prime is 21401113379. The next prime is 21401113397. The reversal of 21401113387 is 78331110412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21401113387 - 2³ = 21401113379 is a prime.

It is a super-2 number, since 2×21401113387² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21401113397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10700556693 + 10700556694.

It is an arithmetic number, because the mean of its divisors is an integer number (10700556694).

Almost surely, 2^21401113387 is an apocalyptic number.

21401113387 is a deficient number, since it is larger than the sum of its proper divisors (1).

21401113387 is an equidigital number, since it uses as much as digits as its factorization.

21401113387 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 31.

Adding to 21401113387 its reverse (78331110412), we get a palindrome (99732223799).

The spelling of 21401113387 in words is "twenty-one billion, four hundred one million, one hundred thirteen thousand, three hundred eighty-seven".