1021031432521 has 3 divisors (see below), whose sum is σ = 1021032442983. Its totient is φ = 1021030422060.

The previous prime is 1021031432507. The next prime is 1021031432539. The reversal of 1021031432521 is 1252341301201.

The square root of 1021031432521 is 1010461.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 3394344121 + 1017637088400 = 58261^2 + 1008780^2 .

It is not a de Polignac number, because 1021031432521 - 2¹⁵ = 1021031399753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1021031432021) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 505231 + ... + 1515691.

It is an arithmetic number, because the mean of its divisors is an integer number (340344147661).

Almost surely, 2^{1021031432521} is an apocalyptic number.

1021031432521 is the 1010461-st square number.

1021031432521 is the 505231-st centered octagonal number.

It is an amenable number.

1021031432521 is a deficient number, since it is larger than the sum of its proper divisors (1010462).

1021031432521 is an frugal number, since it uses more digits than its factorization.

1021031432521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2020922 (or 1010461 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

Multiplying 1021031432521 by its sum of digits (25), we get a square (25525785813025 = 5052305²).

Adding to 1021031432521 its reverse (1252341301201), we get a palindrome (2273372733722).

The spelling of 1021031432521 in words is "one trillion, twenty-one billion, thirty-one million, four hundred thirty-two thousand, five hundred twenty-one".