20021001229 has 2 divisors, whose sum is σ = 20021001230. Its totient is φ = 20021001228.

The previous prime is 20021001193. The next prime is 20021001239. The reversal of 20021001229 is 92210012002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18549895204 + 1471106025 = 136198^2 + 38355^2 .

It is a cyclic number.

It is not a de Polignac number, because 20021001229 - 2²¹ = 20018904077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20021001239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10010500614 + 10010500615.

It is an arithmetic number, because the mean of its divisors is an integer number (10010500615).

Almost surely, 2^20021001229 is an apocalyptic number.

It is an amenable number.

20021001229 is a deficient number, since it is larger than the sum of its proper divisors (1).

20021001229 is an equidigital number, since it uses as much as digits as its factorization.

20021001229 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 19.

The spelling of 20021001229 in words is "twenty billion, twenty-one million, one thousand, two hundred twenty-nine".