20010121202121 has 8 divisors (see below), whose sum is σ = 26694732970944. Its totient is φ = 13332795117360.

The previous prime is 20010121202119. The next prime is 20010121202147. The reversal of 20010121202121 is 12120212101002.

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

It is not a de Polignac number, because 20010121202121 - 2¹ = 20010121202119 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20010121202121.

It is not an unprimeable number, because it can be changed into a prime (20010121202161) 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, 1821414606 + ... + 1821425591.

It is an arithmetic number, because the mean of its divisors is an integer number (3336841621368).

Almost surely, 2^{20010121202121} is an apocalyptic number.

It is an amenable number.

20010121202121 is a deficient number, since it is larger than the sum of its proper divisors (6684611768823).

20010121202121 is a wasteful number, since it uses less digits than its factorization.

20010121202121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3642842031.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 20010121202121 its reverse (12120212101002), we get a palindrome (32130333303123).

The spelling of 20010121202121 in words is "twenty trillion, ten billion, one hundred twenty-one million, two hundred two thousand, one hundred twenty-one".