340540401221 has 2 divisors, whose sum is σ = 340540401222. Its totient is φ = 340540401220.

The previous prime is 340540401203. The next prime is 340540401263. The reversal of 340540401221 is 122104045043.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 322494508996 + 18045892225 = 567886^2 + 134335^2 .

It is an emirp because it is prime and its reverse (122104045043) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-340540401221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (340540404221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 170270200610 + 170270200611.

It is an arithmetic number, because the mean of its divisors is an integer number (170270200611).

Almost surely, 2^340540401221 is an apocalyptic number.

It is an amenable number.

340540401221 is a deficient number, since it is larger than the sum of its proper divisors (1).

340540401221 is an equidigital number, since it uses as much as digits as its factorization.

340540401221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3840, while the sum is 26.

Adding to 340540401221 its reverse (122104045043), we get a palindrome (462644446264).

The spelling of 340540401221 in words is "three hundred forty billion, five hundred forty million, four hundred one thousand, two hundred twenty-one".