2021103421 has 2 divisors, whose sum is σ = 2021103422. Its totient is φ = 2021103420.

The previous prime is 2021103407. The next prime is 2021103443. The reversal of 2021103421 is 1243011202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1943575396 + 77528025 = 44086^2 + 8805^2 .

It is a cyclic number.

It is not a de Polignac number, because 2021103421 - 2²⁹ = 1484232509 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2021103395 and 2021103404.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2021103451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010551710 + 1010551711.

It is an arithmetic number, because the mean of its divisors is an integer number (1010551711).

Almost surely, 2^2021103421 is an apocalyptic number.

It is an amenable number.

2021103421 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021103421 is an equidigital number, since it uses as much as digits as its factorization.

2021103421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 2021103421 is about 44956.6838301047. The cubic root of 2021103421 is about 1264.3369949229.

Adding to 2021103421 its reverse (1243011202), we get a palindrome (3264114623).

The spelling of 2021103421 in words is "two billion, twenty-one million, one hundred three thousand, four hundred twenty-one".