2104021421 has 2 divisors, whose sum is σ = 2104021422. Its totient is φ = 2104021420.

The previous prime is 2104021417. The next prime is 2104021453. The reversal of 2104021421 is 1241204012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1860973321 + 243048100 = 43139^2 + 15590^2 .

It is a cyclic number.

It is not a de Polignac number, because 2104021421 - 2² = 2104021417 is a prime.

It is a super-2 number, since 2×2104021421² = 8853812280053718482, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2104021421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2104021481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1052010710 + 1052010711.

It is an arithmetic number, because the mean of its divisors is an integer number (1052010711).

Almost surely, 2^2104021421 is an apocalyptic number.

It is an amenable number.

2104021421 is a deficient number, since it is larger than the sum of its proper divisors (1).

2104021421 is an equidigital number, since it uses as much as digits as its factorization.

2104021421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 2104021421 is about 45869.6132641207. The cubic root of 2104021421 is about 1281.3960640744.

Adding to 2104021421 its reverse (1241204012), we get a palindrome (3345225433).

The spelling of 2104021421 in words is "two billion, one hundred four million, twenty-one thousand, four hundred twenty-one".