20122121011021 has 2 divisors, whose sum is σ = 20122121011022. Its totient is φ = 20122121011020.

The previous prime is 20122121011009. The next prime is 20122121011049. The reversal of 20122121011021 is 12011012122102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11638946328100 + 8483174682921 = 3411590^2 + 2912589^2 .

It is a cyclic number.

It is not a de Polignac number, because 20122121011021 - 2²⁵ = 20122087456589 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20122121010986 and 20122121011004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20122121011051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10061060505510 + 10061060505511.

It is an arithmetic number, because the mean of its divisors is an integer number (10061060505511).

Almost surely, 2^{20122121011021} is an apocalyptic number.

It is an amenable number.

20122121011021 is a deficient number, since it is larger than the sum of its proper divisors (1).

20122121011021 is an equidigital number, since it uses as much as digits as its factorization.

20122121011021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 20122121011021 its reverse (12011012122102), we get a palindrome (32133133133123).

The spelling of 20122121011021 in words is "twenty trillion, one hundred twenty-two billion, one hundred twenty-one million, eleven thousand, twenty-one".