1021331429 has 4 divisors (see below), whose sum is σ = 1021615884. Its totient is φ = 1021046976.

The previous prime is 1021331401. The next prime is 1021331449. The reversal of 1021331429 is 9241331201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9241331201 = 853 ⋅10833917.

It can be written as a sum of positive squares in 2 ways, for example, as 441966529 + 579364900 = 21023^2 + 24070^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1021331429 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1021331398 and 1021331407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021331449) 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, 136772 + ... + 144045.

It is an arithmetic number, because the mean of its divisors is an integer number (255403971).

Almost surely, 2^1021331429 is an apocalyptic number.

It is an amenable number.

1021331429 is a deficient number, since it is larger than the sum of its proper divisors (284455).

1021331429 is an equidigital number, since it uses as much as digits as its factorization.

1021331429 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284454.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 1021331429 is about 31958.2763771765. The cubic root of 1021331429 is about 1007.0605082329.

The spelling of 1021331429 in words is "one billion, twenty-one million, three hundred thirty-one thousand, four hundred twenty-nine".