3731121055321 has 9 divisors (see below), whose sum is σ = 4101172944799. Its totient is φ = 3391908916000.

The previous prime is 3731121055307. The next prime is 3731121055427. The reversal of 3731121055321 is 1235501211373.

The square root of 3731121055321 is 1931611.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 1389241752921 + 2341879302400 = 1178661^2 + 1530320^2 .

It is not a de Polignac number, because 3731121055321 - 2¹¹ = 3731121053273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3731121055621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 21159921 + ... + 21335521.

Almost surely, 2^{3731121055321} is an apocalyptic number.

3731121055321 is the 1931611-st square number.

3731121055321 is the 965806-th centered octagonal number.

It is an amenable number.

3731121055321 is a deficient number, since it is larger than the sum of its proper divisors (370051889478).

3731121055321 is an frugal number, since it uses more digits than its factorization.

3731121055321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 351224 (or 175612 counting only the distinct ones).

The product of its (nonzero) digits is 18900, while the sum is 34.

Adding to 3731121055321 its reverse (1235501211373), we get a palindrome (4966622266694).

The spelling of 3731121055321 in words is "three trillion, seven hundred thirty-one billion, one hundred twenty-one million, fifty-five thousand, three hundred twenty-one".