2021001321 has 16 divisors (see below), whose sum is σ = 2802843648. Its totient is φ = 1293910800.

The previous prime is 2021001319. The next prime is 2021001337. The reversal of 2021001321 is 1231001202.

It is not a de Polignac number, because 2021001321 - 2¹ = 2021001319 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2021001297 and 2021001306.

It is not an unprimeable number, because it can be changed into a prime (2021001371) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 70761 + ... + 95126.

It is an arithmetic number, because the mean of its divisors is an integer number (175177728).

Almost surely, 2^2021001321 is an apocalyptic number.

It is an amenable number.

2021001321 is a deficient number, since it is larger than the sum of its proper divisors (781842327).

2021001321 is a wasteful number, since it uses less digits than its factorization.

2021001321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166052.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 2021001321 is about 44955.5482782715. The cubic root of 2021001321 is about 1264.3157044107.

Adding to 2021001321 its reverse (1231001202), we get a palindrome (3252002523).

The spelling of 2021001321 in words is "two billion, twenty-one million, one thousand, three hundred twenty-one".