20121102101 has 4 divisors (see below), whose sum is σ = 20589034752. Its totient is φ = 19653169452.

The previous prime is 20121102091. The next prime is 20121102109. The reversal of 20121102101 is 10120112102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20121102101 - 2⁶ = 20121102037 is a prime.

It is a super-2 number, since 2×20121102101² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20121102109) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 233966261 + ... + 233966346.

It is an arithmetic number, because the mean of its divisors is an integer number (5147258688).

Almost surely, 2^20121102101 is an apocalyptic number.

It is an amenable number.

20121102101 is a deficient number, since it is larger than the sum of its proper divisors (467932651).

20121102101 is an equidigital number, since it uses as much as digits as its factorization.

20121102101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 467932650.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 20121102101 its reverse (10120112102), we get a palindrome (30241214203).

The spelling of 20121102101 in words is "twenty billion, one hundred twenty-one million, one hundred two thousand, one hundred one".