87443656261421 has 2 divisors, whose sum is σ = 87443656261422. Its totient is φ = 87443656261420.

The previous prime is 87443656261279. The next prime is 87443656261463. The reversal of 87443656261421 is 12416265634478.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 82290551959396 + 5153104302025 = 9071414^2 + 2270045^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87443656261421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87443656261021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43721828130710 + 43721828130711.

It is an arithmetic number, because the mean of its divisors is an integer number (43721828130711).

Almost surely, 2^{87443656261421} is an apocalyptic number.

It is an amenable number.

87443656261421 is a deficient number, since it is larger than the sum of its proper divisors (1).

87443656261421 is an equidigital number, since it uses as much as digits as its factorization.

87443656261421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46448640, while the sum is 59.

The spelling of 87443656261421 in words is "eighty-seven trillion, four hundred forty-three billion, six hundred fifty-six million, two hundred sixty-one thousand, four hundred twenty-one".