1021242431 has 4 divisors (see below), whose sum is σ = 1114082664. Its totient is φ = 928402200.

The previous prime is 1021242427. The next prime is 1021242437. The reversal of 1021242431 is 1342421201.

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

It is not a de Polignac number, because 1021242431 - 2² = 1021242427 is a prime.

It is a super-2 number, since 2×1021242431² = 2085872205749579522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021242437) 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, 46420100 + ... + 46420121.

It is an arithmetic number, because the mean of its divisors is an integer number (278520666).

Almost surely, 2^1021242431 is an apocalyptic number.

1021242431 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1021242431 is a deficient number, since it is larger than the sum of its proper divisors (92840233).

1021242431 is an equidigital number, since it uses as much as digits as its factorization.

1021242431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92840232.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 1021242431 is about 31956.8839375806. The cubic root of 1021242431 is about 1007.0312559021.

Adding to 1021242431 its reverse (1342421201), we get a palindrome (2363663632).

The spelling of 1021242431 in words is "one billion, twenty-one million, two hundred forty-two thousand, four hundred thirty-one".