1540014252221 has 2 divisors, whose sum is σ = 1540014252222. Its totient is φ = 1540014252220.

The previous prime is 1540014252211. The next prime is 1540014252277. The reversal of 1540014252221 is 1222524100451.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 786609348100 + 753404904121 = 886910^2 + 867989^2 .

It is a cyclic number.

It is not a de Polignac number, because 1540014252221 - 2¹⁰ = 1540014251197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1540014252211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 770007126110 + 770007126111.

It is an arithmetic number, because the mean of its divisors is an integer number (770007126111).

Almost surely, 2^{1540014252221} is an apocalyptic number.

It is an amenable number.

1540014252221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1540014252221 is an equidigital number, since it uses as much as digits as its factorization.

1540014252221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6400, while the sum is 29.

Adding to 1540014252221 its reverse (1222524100451), we get a palindrome (2762538352672).

The spelling of 1540014252221 in words is "one trillion, five hundred forty billion, fourteen million, two hundred fifty-two thousand, two hundred twenty-one".