20121320322121 has 16 divisors (see below), whose sum is σ = 21953833205760. Its totient is φ = 18378263938320.

The previous prime is 20121320322097. The next prime is 20121320322137. The reversal of 20121320322121 is 12122302312102.

It is a cyclic number.

It is not a de Polignac number, because 20121320322121 - 2¹⁵ = 20121320289353 is a prime.

It is a super-3 number, since 3×20121320322121³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20121320322092 and 20121320322101.

It is not an unprimeable number, because it can be changed into a prime (20121320322221) 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, 168091465 + ... + 168211126.

It is an arithmetic number, because the mean of its divisors is an integer number (1372114575360).

Almost surely, 2^{20121320322121} is an apocalyptic number.

It is an amenable number.

20121320322121 is a deficient number, since it is larger than the sum of its proper divisors (1832512883639).

20121320322121 is a wasteful number, since it uses less digits than its factorization.

20121320322121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336302724.

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 20121320322121 its reverse (12122302312102), we get a palindrome (32243622634223).

The spelling of 20121320322121 in words is "twenty trillion, one hundred twenty-one billion, three hundred twenty million, three hundred twenty-two thousand, one hundred twenty-one".