20321117212 has 96 divisors (see below), whose sum is σ = 42343741440. Its totient is φ = 8428907520.

The previous prime is 20321117207. The next prime is 20321117261. The reversal of 20321117212 is 21271112302.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3829353 + ... + 3834655.

It is an arithmetic number, because the mean of its divisors is an integer number (441080640).

Almost surely, 2^20321117212 is an apocalyptic number.

20321117212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

20321117212 is an abundant number, since it is smaller than the sum of its proper divisors (22022624228).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20321117212 is a wasteful number, since it uses less digits than its factorization.

20321117212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5491 (or 5489 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 22.

Adding to 20321117212 its reverse (21271112302), we get a palindrome (41592229514).

The spelling of 20321117212 in words is "twenty billion, three hundred twenty-one million, one hundred seventeen thousand, two hundred twelve".