21041053412087 has 2 divisors, whose sum is σ = 21041053412088. Its totient is φ = 21041053412086.

The previous prime is 21041053412069. The next prime is 21041053412123. The reversal of 21041053412087 is 78021435014012.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21041053412087 - 2¹² = 21041053407991 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21041053412087.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21041053492087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10520526706043 + 10520526706044.

It is an arithmetic number, because the mean of its divisors is an integer number (10520526706044).

Almost surely, 2^{21041053412087} is an apocalyptic number.

21041053412087 is a deficient number, since it is larger than the sum of its proper divisors (1).

21041053412087 is an equidigital number, since it uses as much as digits as its factorization.

21041053412087 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 53760, while the sum is 38.

Adding to 21041053412087 its reverse (78021435014012), we get a palindrome (99062488426099).

The spelling of 21041053412087 in words is "twenty-one trillion, forty-one billion, fifty-three million, four hundred twelve thousand, eighty-seven".