20402001321 has 32 divisors (see below), whose sum is σ = 30167786880. Its totient is φ = 12184833024.

The previous prime is 20402001311. The next prime is 20402001331. The reversal of 20402001321 is 12310020402.

It is an interprime number because it is at equal distance from previous prime (20402001311) and next prime (20402001331).

It is not a de Polignac number, because 20402001321 - 2⁵ = 20402001289 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20402001321.

It is not an unprimeable number, because it can be changed into a prime (20402001311) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 224545 + ... + 302033.

It is an arithmetic number, because the mean of its divisors is an integer number (942743340).

Almost surely, 2^20402001321 is an apocalyptic number.

It is an amenable number.

20402001321 is a deficient number, since it is larger than the sum of its proper divisors (9765785559).

20402001321 is a wasteful number, since it uses less digits than its factorization.

20402001321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77705.

The product of its (nonzero) digits is 96, while the sum is 15.

Adding to 20402001321 its reverse (12310020402), we get a palindrome (32712021723).

The spelling of 20402001321 in words is "twenty billion, four hundred two million, one thousand, three hundred twenty-one".