20201210122121 has 12 divisors (see below), whose sum is σ = 23499459436032. Its totient is φ = 17315254760328.

The previous prime is 20201210122069. The next prime is 20201210122169. The reversal of 20201210122121 is 12122101210202.

It is not a de Polignac number, because 20201210122121 - 2¹⁴ = 20201210105737 is a prime.

It is a super-3 number, since 3×20201210122121³ (a number of 41 digits) contains 333 as substring.

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 20201210122121.

It is not an unprimeable number, because it can be changed into a prime (20201210122021) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14779736 + ... + 16088598.

It is an arithmetic number, because the mean of its divisors is an integer number (1958288286336).

Almost surely, 2^{20201210122121} is an apocalyptic number.

It is an amenable number.

20201210122121 is a deficient number, since it is larger than the sum of its proper divisors (3298249313911).

20201210122121 is a wasteful number, since it uses less digits than its factorization.

20201210122121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1623860 (or 1623853 counting only the distinct ones).

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

Adding to 20201210122121 its reverse (12122101210202), we get a palindrome (32323311332323).

The spelling of 20201210122121 in words is "twenty trillion, two hundred one billion, two hundred ten million, one hundred twenty-two thousand, one hundred twenty-one".