20323212021 has 48 divisors (see below), whose sum is σ = 34573593600. Its totient is φ = 11498104800.

The previous prime is 20323212017. The next prime is 20323212023. The reversal of 20323212021 is 12021232302.

It is not a de Polignac number, because 20323212021 - 2² = 20323212017 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20323211985 and 20323212003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20323212023) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 279196 + ... + 344378.

It is an arithmetic number, because the mean of its divisors is an integer number (720283200).

Almost surely, 2^20323212021 is an apocalyptic number.

20323212021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20323212021 is a deficient number, since it is larger than the sum of its proper divisors (14250381579).

20323212021 is a wasteful number, since it uses less digits than its factorization.

20323212021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65311 (or 65294 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 20323212021 its reverse (12021232302), we get a palindrome (32344444323).

The spelling of 20323212021 in words is "twenty billion, three hundred twenty-three million, two hundred twelve thousand, twenty-one".