105421387 has 2 divisors, whose sum is σ = 105421388. Its totient is φ = 105421386.

The previous prime is 105421361. The next prime is 105421447. The reversal of 105421387 is 783124501.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 105421387 - 2²³ = 97032779 is a prime.

It is a super-2 number, since 2×105421387² = 22227337674007538, which contains 22 as substring.

It is a Chen prime.

It is equal to p_6055537 and since 105421387 and 6055537 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (105421357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52710693 + 52710694.

It is an arithmetic number, because the mean of its divisors is an integer number (52710694).

Almost surely, 2^105421387 is an apocalyptic number.

105421387 is a deficient number, since it is larger than the sum of its proper divisors (1).

105421387 is an equidigital number, since it uses as much as digits as its factorization.

105421387 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 105421387 is about 10267.4917579709. The cubic root of 105421387 is about 472.3996588063.

Adding to 105421387 its reverse (783124501), we get a palindrome (888545888).

The spelling of 105421387 in words is "one hundred five million, four hundred twenty-one thousand, three hundred eighty-seven".