2021323431 has 16 divisors (see below), whose sum is σ = 2770019424. Its totient is φ = 1310143104.

The previous prime is 2021323429. The next prime is 2021323433. The reversal of 2021323431 is 1343231202.

It is an interprime number because it is at equal distance from previous prime (2021323429) and next prime (2021323433).

It is not a de Polignac number, because 2021323431 - 2¹ = 2021323429 is a prime.

It is a super-2 number, since 2×2021323431² = 8171496825419223522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2021323398 and 2021323407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021323433) 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 15 ways as a sum of consecutive naturals, for example, 159625 + ... + 171821.

It is an arithmetic number, because the mean of its divisors is an integer number (173126214).

Almost surely, 2^2021323431 is an apocalyptic number.

2021323431 is a deficient number, since it is larger than the sum of its proper divisors (748695993).

2021323431 is a wasteful number, since it uses less digits than its factorization.

2021323431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13730.

The product of its (nonzero) digits is 864, while the sum is 21.

The square root of 2021323431 is about 44959.1306744247. The cubic root of 2021323431 is about 1264.3828703074.

Adding to 2021323431 its reverse (1343231202), we get a palindrome (3364554633).

The spelling of 2021323431 in words is "two billion, twenty-one million, three hundred twenty-three thousand, four hundred thirty-one".