101505421 has 2 divisors, whose sum is σ = 101505422. Its totient is φ = 101505420.

The previous prime is 101505407. The next prime is 101505449. The reversal of 101505421 is 124505101.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 90516196 + 10989225 = 9514^2 + 3315^2 .

It is a cyclic number.

It is not a de Polignac number, because 101505421 - 2⁵ = 101505389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (101505401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50752710 + 50752711.

It is an arithmetic number, because the mean of its divisors is an integer number (50752711).

Almost surely, 2^101505421 is an apocalyptic number.

It is an amenable number.

101505421 is a deficient number, since it is larger than the sum of its proper divisors (1).

101505421 is an equidigital number, since it uses as much as digits as its factorization.

101505421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 200, while the sum is 19.

The square root of 101505421 is about 10074.9898759254. The cubic root of 101505421 is about 466.4764739136.

It can be divided in two parts, 101505 and 421, that added together give a triangular number (101926 = T₄₅₁).

The spelling of 101505421 in words is "one hundred one million, five hundred five thousand, four hundred twenty-one".