20212211012121 has 6 divisors (see below), whose sum is σ = 29195415906410. Its totient is φ = 13474807341408.

The previous prime is 20212211012111. The next prime is 20212211012159. The reversal of 20212211012121 is 12121011221202.

It can be written as a sum of positive squares in only one way, i.e., 18383127878025 + 1829083134096 = 4287555^2 + 1352436^2 .

It is not a de Polignac number, because 20212211012121 - 2⁹ = 20212211011609 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20212211012094 and 20212211012103.

It is not an unprimeable number, because it can be changed into a prime (20212211012101) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1122900611776 + ... + 1122900611793.

Almost surely, 2^{20212211012121} is an apocalyptic number.

It is an amenable number.

20212211012121 is a deficient number, since it is larger than the sum of its proper divisors (8983204894289).

20212211012121 is a wasteful number, since it uses less digits than its factorization.

20212211012121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2245801223575 (or 2245801223572 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 20212211012121 its reverse (12121011221202), we get a palindrome (32333222233323).

The spelling of 20212211012121 in words is "twenty trillion, two hundred twelve billion, two hundred eleven million, twelve thousand, one hundred twenty-one".