21501514131389 has 2 divisors, whose sum is σ = 21501514131390. Its totient is φ = 21501514131388.

The previous prime is 21501514131373. The next prime is 21501514131547. The reversal of 21501514131389 is 98313141510512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20547635702500 + 953878428889 = 4532950^2 + 976667^2 .

It is a cyclic number.

It is not a de Polignac number, because 21501514131389 - 2⁴ = 21501514131373 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21501414131389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10750757065694 + 10750757065695.

It is an arithmetic number, because the mean of its divisors is an integer number (10750757065695).

Almost surely, 2^{21501514131389} is an apocalyptic number.

It is an amenable number.

21501514131389 is a deficient number, since it is larger than the sum of its proper divisors (1).

21501514131389 is an equidigital number, since it uses as much as digits as its factorization.

21501514131389 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 129600, while the sum is 44.

The spelling of 21501514131389 in words is "twenty-one trillion, five hundred one billion, five hundred fourteen million, one hundred thirty-one thousand, three hundred eighty-nine".