1021220431 has 8 divisors (see below), whose sum is σ = 1273209984. Its totient is φ = 795756120.

The previous prime is 1021220423. The next prime is 1021220441. The reversal of 1021220431 is 1340221201.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1021220431 - 2³ = 1021220423 is a prime.

It is a super-2 number, since 2×1021220431² = 2085782337383651522, 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 (1021220441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6631225 + ... + 6631378.

It is an arithmetic number, because the mean of its divisors is an integer number (159151248).

Almost surely, 2^1021220431 is an apocalyptic number.

1021220431 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1021220431 is a deficient number, since it is larger than the sum of its proper divisors (251989553).

1021220431 is a wasteful number, since it uses less digits than its factorization.

1021220431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13262621.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 1021220431 is about 31956.5397219411. The cubic root of 1021220431 is about 1007.0240245643.

Adding to 1021220431 its reverse (1340221201), we get a palindrome (2361441632).

The spelling of 1021220431 in words is "one billion, twenty-one million, two hundred twenty thousand, four hundred thirty-one".