1021375018161 has 27 divisors (see below), whose sum is σ = 1524585908313. Its totient is φ = 658890986760.

The previous prime is 1021375018159. The next prime is 1021375018163. The reversal of 1021375018161 is 1618105731201.

It is a happy number.

The square root of 1021375018161 is 1010631.

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

1021375018161 is a `hidden beast` number, since 1 + 0 + 2 + 13 + 7 + 501 + 81 + 61 = 666.

It is an interprime number because it is at equal distance from previous prime (1021375018159) and next prime (1021375018163).

It is not a de Polignac number, because 1021375018161 - 2¹ = 1021375018159 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1021375018163) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 93983250 + ... + 93994116.

Almost surely, 2^{1021375018161} is an apocalyptic number.

1021375018161 is the 1010631-st square number.

1021375018161 is the 505316-th centered octagonal number.

It is an amenable number.

1021375018161 is a deficient number, since it is larger than the sum of its proper divisors (503210890152).

1021375018161 is an frugal number, since it uses more digits than its factorization.

1021375018161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21802 (or 10901 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 36.

Multiplying 1021375018161 by its sum of digits (36), we get a square (36769500653796 = 6063786²).

The spelling of 1021375018161 in words is "one trillion, twenty-one billion, three hundred seventy-five million, eighteen thousand, one hundred sixty-one".