21210202201087 has 2 divisors, whose sum is σ = 21210202201088. Its totient is φ = 21210202201086.

The previous prime is 21210202201073. The next prime is 21210202201121. The reversal of 21210202201087 is 78010220201212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21210202201087 - 2³⁹ = 20660446387199 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21210202201037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10605101100543 + 10605101100544.

It is an arithmetic number, because the mean of its divisors is an integer number (10605101100544).

Almost surely, 2^{21210202201087} is an apocalyptic number.

21210202201087 is a deficient number, since it is larger than the sum of its proper divisors (1).

21210202201087 is an equidigital number, since it uses as much as digits as its factorization.

21210202201087 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1792, while the sum is 28.

Adding to 21210202201087 its reverse (78010220201212), we get a palindrome (99220422402299).

The spelling of 21210202201087 in words is "twenty-one trillion, two hundred ten billion, two hundred two million, two hundred one thousand, eighty-seven".