1354721387221 has 2 divisors, whose sum is σ = 1354721387222. Its totient is φ = 1354721387220.

The previous prime is 1354721387119. The next prime is 1354721387251. The reversal of 1354721387221 is 1227831274531.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1119122788996 + 235598598225 = 1057886^2 + 485385^2 .

It is an emirp because it is prime and its reverse (1227831274531) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1354721387221 - 2¹⁹ = 1354720862933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1354721387251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 677360693610 + 677360693611.

It is an arithmetic number, because the mean of its divisors is an integer number (677360693611).

Almost surely, 2^{1354721387221} is an apocalyptic number.

It is an amenable number.

1354721387221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1354721387221 is an equidigital number, since it uses as much as digits as its factorization.

1354721387221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 564480, while the sum is 46.

The spelling of 1354721387221 in words is "one trillion, three hundred fifty-four billion, seven hundred twenty-one million, three hundred eighty-seven thousand, two hundred twenty-one".