20010122212121 has 4 divisors (see below), whose sum is σ = 20144418334500. Its totient is φ = 19875826089744.

The previous prime is 20010122212099. The next prime is 20010122212127. The reversal of 20010122212121 is 12121222101002.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9309601754896 + 10700520457225 = 3051164^2 + 3271165^2 .

It is a cyclic number.

It is not a de Polignac number, because 20010122212121 - 2¹⁴ = 20010122195737 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20010122212121.

It is not an unprimeable number, because it can be changed into a prime (20010122212127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67148060966 + ... + 67148061263.

It is an arithmetic number, because the mean of its divisors is an integer number (5036104583625).

Almost surely, 2^{20010122212121} is an apocalyptic number.

It is an amenable number.

20010122212121 is a deficient number, since it is larger than the sum of its proper divisors (134296122379).

20010122212121 is a wasteful number, since it uses less digits than its factorization.

20010122212121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134296122378.

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

Adding to 20010122212121 its reverse (12121222101002), we get a palindrome (32131344313123).

The spelling of 20010122212121 in words is "twenty trillion, ten billion, one hundred twenty-two million, two hundred twelve thousand, one hundred twenty-one".