2021431421 has 2 divisors, whose sum is σ = 2021431422. Its totient is φ = 2021431420.

The previous prime is 2021431409. The next prime is 2021431463. The reversal of 2021431421 is 1241341202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1788105796 + 233325625 = 42286^2 + 15275^2 .

It is a cyclic number.

It is not a de Polignac number, because 2021431421 - 2¹⁴ = 2021415037 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2021431393 and 2021431402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2021439421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010715710 + 1010715711.

It is an arithmetic number, because the mean of its divisors is an integer number (1010715711).

Almost surely, 2^2021431421 is an apocalyptic number.

It is an amenable number.

2021431421 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021431421 is an equidigital number, since it uses as much as digits as its factorization.

2021431421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 2021431421 is about 44960.3316380117. The cubic root of 2021431421 is about 1264.4053866239.

Adding to 2021431421 its reverse (1241341202), we get a palindrome (3262772623).

The spelling of 2021431421 in words is "two billion, twenty-one million, four hundred thirty-one thousand, four hundred twenty-one".