1295371661221 has 16 divisors (see below), whose sum is σ = 1516754878848. Its totient is φ = 1093156646400.

The previous prime is 1295371661209. The next prime is 1295371661237. The reversal of 1295371661221 is 1221661735921.

It is a cyclic number.

It is not a de Polignac number, because 1295371661221 - 2²³ = 1295363272613 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1295371661921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47432385 + ... + 47459686.

It is an arithmetic number, because the mean of its divisors is an integer number (94797179928).

Almost surely, 2^{1295371661221} is an apocalyptic number.

1295371661221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1295371661221 is a deficient number, since it is larger than the sum of its proper divisors (221383217627).

1295371661221 is a wasteful number, since it uses less digits than its factorization.

1295371661221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94892172.

The product of its digits is 272160, while the sum is 46.

The spelling of 1295371661221 in words is "one trillion, two hundred ninety-five billion, three hundred seventy-one million, six hundred sixty-one thousand, two hundred twenty-one".