20212121029 has 2 divisors, whose sum is σ = 20212121030. Its totient is φ = 20212121028.

The previous prime is 20212121023. The next prime is 20212121053. The reversal of 20212121029 is 92012121202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12515568129 + 7696552900 = 111873^2 + 87730^2 .

It is a cyclic number.

It is not a de Polignac number, because 20212121029 - 2³ = 20212121021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20212121021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10106060514 + 10106060515.

It is an arithmetic number, because the mean of its divisors is an integer number (10106060515).

Almost surely, 2^20212121029 is an apocalyptic number.

It is an amenable number.

20212121029 is a deficient number, since it is larger than the sum of its proper divisors (1).

20212121029 is an equidigital number, since it uses as much as digits as its factorization.

20212121029 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 22.

The spelling of 20212121029 in words is "twenty billion, two hundred twelve million, one hundred twenty-one thousand, twenty-nine".