2140215421 has 2 divisors, whose sum is σ = 2140215422. Its totient is φ = 2140215420.

The previous prime is 2140215401. The next prime is 2140215443. The reversal of 2140215421 is 1245120412.

It is an a-pointer prime, because the next prime (2140215443) can be obtained adding 2140215421 to its sum of digits (22).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1460309796 + 679905625 = 38214^2 + 26075^2 .

It is a cyclic number.

It is not a de Polignac number, because 2140215421 - 2²⁵ = 2106660989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2140215392 and 2140215401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2140215401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1070107710 + 1070107711.

It is an arithmetic number, because the mean of its divisors is an integer number (1070107711).

Almost surely, 2^2140215421 is an apocalyptic number.

It is an amenable number.

2140215421 is a deficient number, since it is larger than the sum of its proper divisors (1).

2140215421 is an equidigital number, since it uses as much as digits as its factorization.

2140215421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 2140215421 is about 46262.4623317869. The cubic root of 2140215421 is about 1288.7019816138.

Adding to 2140215421 its reverse (1245120412), we get a palindrome (3385335833).

The spelling of 2140215421 in words is "two billion, one hundred forty million, two hundred fifteen thousand, four hundred twenty-one".