20110221029 has 2 divisors, whose sum is σ = 20110221030. Its totient is φ = 20110221028.

The previous prime is 20110221023. The next prime is 20110221041. The reversal of 20110221029 is 92012201102.

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., 18144628804 + 1965592225 = 134702^2 + 44335^2 .

It is a cyclic number.

It is not a de Polignac number, because 20110221029 - 2¹² = 20110216933 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20110221029.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20110221023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10055110514 + 10055110515.

It is an arithmetic number, because the mean of its divisors is an integer number (10055110515).

Almost surely, 2^20110221029 is an apocalyptic number.

It is an amenable number.

20110221029 is a deficient number, since it is larger than the sum of its proper divisors (1).

20110221029 is an equidigital number, since it uses as much as digits as its factorization.

20110221029 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 20.

The spelling of 20110221029 in words is "twenty billion, one hundred ten million, two hundred twenty-one thousand, twenty-nine".