21202121100187 has 2 divisors, whose sum is σ = 21202121100188. Its totient is φ = 21202121100186.

The previous prime is 21202121100107. The next prime is 21202121100221. The reversal of 21202121100187 is 78100112120212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21202121100187 - 2¹⁵ = 21202121067419 is a prime.

It is not a weakly prime, because it can be changed into another prime (21202121100107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10601060550093 + 10601060550094.

It is an arithmetic number, because the mean of its divisors is an integer number (10601060550094).

Almost surely, 2^{21202121100187} is an apocalyptic number.

21202121100187 is a deficient number, since it is larger than the sum of its proper divisors (1).

21202121100187 is an equidigital number, since it uses as much as digits as its factorization.

21202121100187 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 896, while the sum is 28.

Adding to 21202121100187 its reverse (78100112120212), we get a palindrome (99302233220399).

The spelling of 21202121100187 in words is "twenty-one trillion, two hundred two billion, one hundred twenty-one million, one hundred thousand, one hundred eighty-seven".