1021152452521 has 4 divisors (see below), whose sum is σ = 1048751167492. Its totient is φ = 993553737552.

The previous prime is 1021152452443. The next prime is 1021152452581. The reversal of 1021152452521 is 1252542511201.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 942819638121 + 78332814400 = 970989^2 + 279880^2 .

It is a cyclic number.

It is not a de Polignac number, because 1021152452521 - 2¹⁵ = 1021152419753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1021152452581) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13799357430 + ... + 13799357503.

It is an arithmetic number, because the mean of its divisors is an integer number (262187791873).

Almost surely, 2^{1021152452521} is an apocalyptic number.

It is an amenable number.

1021152452521 is a deficient number, since it is larger than the sum of its proper divisors (27598714971).

1021152452521 is an equidigital number, since it uses as much as digits as its factorization.

1021152452521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27598714970.

The product of its (nonzero) digits is 8000, while the sum is 31.

Adding to 1021152452521 its reverse (1252542511201), we get a palindrome (2273694963722).

The spelling of 1021152452521 in words is "one trillion, twenty-one billion, one hundred fifty-two million, four hundred fifty-two thousand, five hundred twenty-one".