87013033621 has 2 divisors, whose sum is σ = 87013033622. Its totient is φ = 87013033620.

The previous prime is 87013033577. The next prime is 87013033637. The reversal of 87013033621 is 12633031078.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70005222225 + 17007811396 = 264585^2 + 130414^2 .

It is a cyclic number.

It is not a de Polignac number, because 87013033621 - 2²⁷ = 86878815893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87013033691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43506516810 + 43506516811.

It is an arithmetic number, because the mean of its divisors is an integer number (43506516811).

Almost surely, 2^87013033621 is an apocalyptic number.

It is an amenable number.

87013033621 is a deficient number, since it is larger than the sum of its proper divisors (1).

87013033621 is an equidigital number, since it uses as much as digits as its factorization.

87013033621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 34.

Adding to 87013033621 its reverse (12633031078), we get a palindrome (99646064699).

The spelling of 87013033621 in words is "eighty-seven billion, thirteen million, thirty-three thousand, six hundred twenty-one".