1021211332431 has 4 divisors (see below), whose sum is σ = 1361615109912. Its totient is φ = 680807554952.

The previous prime is 1021211332423. The next prime is 1021211332441. The reversal of 1021211332431 is 1342331121201.

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

It is a cyclic number.

It is not a de Polignac number, because 1021211332431 - 2³ = 1021211332423 is a prime.

It is a super-2 number, since 2×1021211332431² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021211332441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 170201888736 + ... + 170201888741.

It is an arithmetic number, because the mean of its divisors is an integer number (340403777478).

Almost surely, 2^{1021211332431} is an apocalyptic number.

1021211332431 is a deficient number, since it is larger than the sum of its proper divisors (340403777481).

1021211332431 is an equidigital number, since it uses as much as digits as its factorization.

1021211332431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340403777480.

The product of its (nonzero) digits is 864, while the sum is 24.

Adding to 1021211332431 its reverse (1342331121201), we get a palindrome (2363542453632).

The spelling of 1021211332431 in words is "one trillion, twenty-one billion, two hundred eleven million, three hundred thirty-two thousand, four hundred thirty-one".