20101020321 has 16 divisors (see below), whose sum is σ = 27120153024. Its totient is φ = 13241916864.

The previous prime is 20101020319. The next prime is 20101020391. The reversal of 20101020321 is 12302010102.

It is not a de Polignac number, because 20101020321 - 2¹ = 20101020319 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20101020297 and 20101020306.

It is not an unprimeable number, because it can be changed into a prime (20101020391) 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 15 ways as a sum of consecutive naturals, for example, 48571 + ... + 206303.

It is an arithmetic number, because the mean of its divisors is an integer number (1695009564).

Almost surely, 2^20101020321 is an apocalyptic number.

It is an amenable number.

20101020321 is a deficient number, since it is larger than the sum of its proper divisors (7019132703).

20101020321 is a wasteful number, since it uses less digits than its factorization.

20101020321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158240.

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

Adding to 20101020321 its reverse (12302010102), we get a palindrome (32403030423).

The spelling of 20101020321 in words is "twenty billion, one hundred one million, twenty thousand, three hundred twenty-one".