1021597369081 has 9 divisors (see below), whose sum is σ = 1027114172301. Its totient is φ = 1016110056192.

The previous prime is 1021597369061. The next prime is 1021597369097. The reversal of 1021597369081 is 1809637951201.

The square root of 1021597369081 is 1010741.

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

It can be written as a sum of positive squares in 4 ways, for example, as 15949416681 + 1005647952400 = 126291^2 + 1002820^2 .

It is not a de Polignac number, because 1021597369081 - 2¹⁵ = 1021597336313 is a prime.

It is a super-2 number, since 2×1021597369081² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1021597369061) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 195070395 + ... + 195075631.

Almost surely, 2^{1021597369081} is an apocalyptic number.

1021597369081 is the 1010741-st square number.

1021597369081 is the 505371-st centered octagonal number.

It is an amenable number.

1021597369081 is a deficient number, since it is larger than the sum of its proper divisors (5516803220).

1021597369081 is an frugal number, since it uses more digits than its factorization.

1021597369081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10860 (or 5430 counting only the distinct ones).

The product of its (nonzero) digits is 816480, while the sum is 52.

The spelling of 1021597369081 in words is "one trillion, twenty-one billion, five hundred ninety-seven million, three hundred sixty-nine thousand, eighty-one".