20121021102 has 64 divisors (see below), whose sum is σ = 49580375040. Its totient is φ = 5301103104.

The previous prime is 20121021101. The next prime is 20121021139. The reversal of 20121021102 is 20112012102.

20121021102 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20121021101) 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, 517974 + ... + 555462.

It is an arithmetic number, because the mean of its divisors is an integer number (774693360).

Almost surely, 2^20121021102 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20121021102, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24790187520).

20121021102 is an abundant number, since it is smaller than the sum of its proper divisors (29459353938).

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

20121021102 is a wasteful number, since it uses less digits than its factorization.

20121021102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38497.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 20121021102 its reverse (20112012102), we get a palindrome (40233033204).

The spelling of 20121021102 in words is "twenty billion, one hundred twenty-one million, twenty-one thousand, one hundred two".