2021431121 has 8 divisors (see below), whose sum is σ = 2149224264. Its totient is φ = 1894625280.

The previous prime is 2021431103. The next prime is 2021431133. The reversal of 2021431121 is 1211341202.

It can be written as a sum of positive squares in 4 ways, for example, as 896164096 + 1125267025 = 29936^2 + 33545^2 .

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 2021431121 - 2²⁶ = 1954322257 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2021431121.

It is not an unprimeable number, because it can be changed into a prime (2021431171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 242600 + ... + 250793.

It is an arithmetic number, because the mean of its divisors is an integer number (268653033).

Almost surely, 2^2021431121 is an apocalyptic number.

It is an amenable number.

2021431121 is a deficient number, since it is larger than the sum of its proper divisors (127793143).

2021431121 is a wasteful number, since it uses less digits than its factorization.

2021431121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 493651.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 2021431121 is about 44960.3283017373. The cubic root of 2021431121 is about 1264.4053240739.

Adding to 2021431121 its reverse (1211341202), we get a palindrome (3232772323).

The spelling of 2021431121 in words is "two billion, twenty-one million, four hundred thirty-one thousand, one hundred twenty-one".