2101211100421 has 2 divisors, whose sum is σ = 2101211100422. Its totient is φ = 2101211100420.

The previous prime is 2101211100407. The next prime is 2101211100467. The reversal of 2101211100421 is 1240011121012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2059712928900 + 41498171521 = 1435170^2 + 203711^2 .

It is a cyclic number.

It is not a de Polignac number, because 2101211100421 - 2⁷ = 2101211100293 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2101211100395 and 2101211100404.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2101211100721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050605550210 + 1050605550211.

It is an arithmetic number, because the mean of its divisors is an integer number (1050605550211).

Almost surely, 2^{2101211100421} is an apocalyptic number.

It is an amenable number.

2101211100421 is a deficient number, since it is larger than the sum of its proper divisors (1).

2101211100421 is an equidigital number, since it uses as much as digits as its factorization.

2101211100421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 2101211100421 its reverse (1240011121012), we get a palindrome (3341222221433).

The spelling of 2101211100421 in words is "two trillion, one hundred one billion, two hundred eleven million, one hundred thousand, four hundred twenty-one".