1306065542221 has 12 divisors (see below), whose sum is σ = 1435783877500. Its totient is φ = 1187174197440.

The previous prime is 1306065542189. The next prime is 1306065542267. The reversal of 1306065542221 is 1222455606031.

It can be written as a sum of positive squares in 2 ways, for example, as 915827946121 + 390237596100 = 956989^2 + 624690^2 .

It is not a de Polignac number, because 1306065542221 - 2⁵ = 1306065542189 is a prime.

It is a super-2 number, since 2×1306065542221² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1306065542021) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 198505 + ... + 1628353.

Almost surely, 2^{1306065542221} is an apocalyptic number.

1306065542221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1306065542221 is a deficient number, since it is larger than the sum of its proper divisors (129718335279).

1306065542221 is a wasteful number, since it uses less digits than its factorization.

1306065542221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1437420 (or 1437409 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 37.

The spelling of 1306065542221 in words is "one trillion, three hundred six billion, sixty-five million, five hundred forty-two thousand, two hundred twenty-one".