20121002121 has 16 divisors (see below), whose sum is σ = 29418563520. Its totient is φ = 12131358720.

The previous prime is 20121002119. The next prime is 20121002123. The reversal of 20121002121 is 12120012102.

It is an interprime number because it is at equal distance from previous prime (20121002119) and next prime (20121002123).

It is not a de Polignac number, because 20121002121 - 2¹ = 20121002119 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20121002097 and 20121002106.

It is not an unprimeable number, because it can be changed into a prime (20121002123) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1573236 + ... + 1585973.

It is an arithmetic number, because the mean of its divisors is an integer number (1838660220).

Almost surely, 2^20121002121 is an apocalyptic number.

It is an amenable number.

20121002121 is a deficient number, since it is larger than the sum of its proper divisors (9297561399).

20121002121 is a wasteful number, since it uses less digits than its factorization.

20121002121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3159416.

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

Adding to 20121002121 its reverse (12120012102), we get a palindrome (32241014223).

The spelling of 20121002121 in words is "twenty billion, one hundred twenty-one million, two thousand, one hundred twenty-one".