20121102121 has 8 divisors (see below), whose sum is σ = 21000921984. Its totient is φ = 19241698080.

The previous prime is 20121102109. The next prime is 20121102143. The reversal of 20121102121 is 12120112102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20121102121 - 2¹³ = 20121093929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20121102151) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2965 + ... + 200626.

It is an arithmetic number, because the mean of its divisors is an integer number (2625115248).

Almost surely, 2^20121102121 is an apocalyptic number.

It is an amenable number.

20121102121 is a deficient number, since it is larger than the sum of its proper divisors (879819863).

20121102121 is a wasteful number, since it uses less digits than its factorization.

20121102121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207911.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 20121102121 its reverse (12120112102), we get a palindrome (32241214223).

The spelling of 20121102121 in words is "twenty billion, one hundred twenty-one million, one hundred two thousand, one hundred twenty-one".