21211012220087 has 2 divisors, whose sum is σ = 21211012220088. Its totient is φ = 21211012220086.

The previous prime is 21211012220063. The next prime is 21211012220143. The reversal of 21211012220087 is 78002221011212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21211012220087 - 2³⁴ = 21193832350903 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21211012220287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10605506110043 + 10605506110044.

It is an arithmetic number, because the mean of its divisors is an integer number (10605506110044).

Almost surely, 2^{21211012220087} is an apocalyptic number.

21211012220087 is a deficient number, since it is larger than the sum of its proper divisors (1).

21211012220087 is an equidigital number, since it uses as much as digits as its factorization.

21211012220087 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1792, while the sum is 29.

Adding to 21211012220087 its reverse (78002221011212), we get a palindrome (99213233231299).

The spelling of 21211012220087 in words is "twenty-one trillion, two hundred eleven billion, twelve million, two hundred twenty thousand, eighty-seven".