2100010421 has 2 divisors, whose sum is σ = 2100010422. Its totient is φ = 2100010420.

The previous prime is 2100010417. The next prime is 2100010427. The reversal of 2100010421 is 1240100012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2081640625 + 18369796 = 45625^2 + 4286^2 .

It is a cyclic number.

It is not a de Polignac number, because 2100010421 - 2² = 2100010417 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2100010427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050005210 + 1050005211.

It is an arithmetic number, because the mean of its divisors is an integer number (1050005211).

Almost surely, 2^2100010421 is an apocalyptic number.

It is an amenable number.

2100010421 is a deficient number, since it is larger than the sum of its proper divisors (1).

2100010421 is an equidigital number, since it uses as much as digits as its factorization.

2100010421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 2100010421 is about 45825.8706518490. The cubic root of 2100010421 is about 1280.5812832245.

Adding to 2100010421 its reverse (1240100012), we get a palindrome (3340110433).

The spelling of 2100010421 in words is "two billion, one hundred million, ten thousand, four hundred twenty-one".