2021121221029 has 2 divisors, whose sum is σ = 2021121221030. Its totient is φ = 2021121221028.

The previous prime is 2021121221011. The next prime is 2021121221059. The reversal of 2021121221029 is 9201221211202.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1652188890625 + 368932330404 = 1285375^2 + 607398^2 .

It is a cyclic number.

It is not a de Polignac number, because 2021121221029 - 2³⁵ = 1986761482661 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2021121220994 and 2021121221012.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2021121221059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010560610514 + 1010560610515.

It is an arithmetic number, because the mean of its divisors is an integer number (1010560610515).

Almost surely, 2^{2021121221029} is an apocalyptic number.

It is an amenable number.

2021121221029 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021121221029 is an equidigital number, since it uses as much as digits as its factorization.

2021121221029 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 25.

The spelling of 2021121221029 in words is "two trillion, twenty-one billion, one hundred twenty-one million, two hundred twenty-one thousand, twenty-nine".