20121202102121 has 16 divisors (see below), whose sum is σ = 20852294641920. Its totient is φ = 19402521761280.

The previous prime is 20121202102109. The next prime is 20121202102151. The reversal of 20121202102121 is 12120120212102.

It is not a de Polignac number, because 20121202102121 - 2³⁸ = 19846324195177 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20121202102121.

It is not an unprimeable number, because it can be changed into a prime (20121202102151) 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, 4385525 + ... + 7712018.

It is an arithmetic number, because the mean of its divisors is an integer number (1303268415120).

Almost surely, 2^{20121202102121} is an apocalyptic number.

It is an amenable number.

20121202102121 is a deficient number, since it is larger than the sum of its proper divisors (731092539799).

20121202102121 is a wasteful number, since it uses less digits than its factorization.

20121202102121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12098056.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 20121202102121 its reverse (12120120212102), we get a palindrome (32241322314223).

The spelling of 20121202102121 in words is "twenty trillion, one hundred twenty-one billion, two hundred two million, one hundred two thousand, one hundred twenty-one".