20321212102 has 4 divisors (see below), whose sum is σ = 30481818156. Its totient is φ = 10160606050.

The previous prime is 20321212081. The next prime is 20321212127. The reversal of 20321212102 is 20121212302.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×20321212102² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5080303024 + ... + 5080303027.

It is an arithmetic number, because the mean of its divisors is an integer number (7620454539).

Almost surely, 2^20321212102 is an apocalyptic number.

20321212102 is a deficient number, since it is larger than the sum of its proper divisors (10160606054).

20321212102 is a wasteful number, since it uses less digits than its factorization.

20321212102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10160606053.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 20321212102 its reverse (20121212302), we get a palindrome (40442424404).

The spelling of 20321212102 in words is "twenty billion, three hundred twenty-one million, two hundred twelve thousand, one hundred two".