1021152452581 has 2 divisors, whose sum is σ = 1021152452582. Its totient is φ = 1021152452580.

The previous prime is 1021152452443. The next prime is 1021152452603. The reversal of 1021152452581 is 1852542511201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 992432371681 + 28720080900 = 996209^2 + 169470^2 .

It is a cyclic number.

It is not a de Polignac number, because 1021152452581 - 2³⁹ = 471396638693 is a prime.

It is a super-2 number, since 2×1021152452581² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1021152452581.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1021152455581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510576226290 + 510576226291.

It is an arithmetic number, because the mean of its divisors is an integer number (510576226291).

Almost surely, 2^{1021152452581} is an apocalyptic number.

It is an amenable number.

1021152452581 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021152452581 is an equidigital number, since it uses as much as digits as its factorization.

1021152452581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32000, while the sum is 37.

Adding to 1021152452581 its reverse (1852542511201), we get a palindrome (2873694963782).

The spelling of 1021152452581 in words is "one trillion, twenty-one billion, one hundred fifty-two million, four hundred fifty-two thousand, five hundred eighty-one".