2141540221 has 2 divisors, whose sum is σ = 2141540222. Its totient is φ = 2141540220.

The previous prime is 2141540183. The next prime is 2141540227. The reversal of 2141540221 is 1220451412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1198128996 + 943411225 = 34614^2 + 30715^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2141540221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2141540192 and 2141540201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2141540227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1070770110 + 1070770111.

It is an arithmetic number, because the mean of its divisors is an integer number (1070770111).

Almost surely, 2^2141540221 is an apocalyptic number.

It is an amenable number.

2141540221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2141540221 is an equidigital number, since it uses as much as digits as its factorization.

2141540221 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 2141540221 is about 46276.7784207155. The cubic root of 2141540221 is about 1288.9678302788.

Adding to 2141540221 its reverse (1220451412), we get a palindrome (3361991633).

The spelling of 2141540221 in words is "two billion, one hundred forty-one million, five hundred forty thousand, two hundred twenty-one".