2140210021 has 2 divisors, whose sum is σ = 2140210022. Its totient is φ = 2140210020.

The previous prime is 2140209997. The next prime is 2140210067. The reversal of 2140210021 is 1200120412.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1784133121 + 356076900 = 42239^2 + 18870^2 .

It is a cyclic number.

It is not a de Polignac number, because 2140210021 - 2¹³ = 2140201829 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2140209983 and 2140210010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2140210081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1070105010 + 1070105011.

It is an arithmetic number, because the mean of its divisors is an integer number (1070105011).

Almost surely, 2^2140210021 is an apocalyptic number.

It is an amenable number.

2140210021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2140210021 is an equidigital number, since it uses as much as digits as its factorization.

2140210021 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 13.

The square root of 2140210021 is about 46262.4039690978. The cubic root of 2140210021 is about 1288.7008977671.

Adding to 2140210021 its reverse (1200120412), we get a palindrome (3340330433).

The spelling of 2140210021 in words is "two billion, one hundred forty million, two hundred ten thousand, twenty-one".