21220101022187 has 2 divisors, whose sum is σ = 21220101022188. Its totient is φ = 21220101022186.

The previous prime is 21220101022139. The next prime is 21220101022243. The reversal of 21220101022187 is 78122010102212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21220101022187 - 2³⁶ = 21151381545451 is a prime.

It is not a weakly prime, because it can be changed into another prime (21220101022987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610050511093 + 10610050511094.

It is an arithmetic number, because the mean of its divisors is an integer number (10610050511094).

Almost surely, 2^{21220101022187} is an apocalyptic number.

21220101022187 is a deficient number, since it is larger than the sum of its proper divisors (1).

21220101022187 is an equidigital number, since it uses as much as digits as its factorization.

21220101022187 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 21220101022187 its reverse (78122010102212), we get a palindrome (99342111124399).

The spelling of 21220101022187 in words is "twenty-one trillion, two hundred twenty billion, one hundred one million, twenty-two thousand, one hundred eighty-seven".