20021021222002 has 16 divisors (see below), whose sum is σ = 32894578479960. Its totient is φ = 9096772319488.

The previous prime is 20021021221997. The next prime is 20021021222003. The reversal of 20021021222002 is 20022212012002.

It can be written as a sum of positive squares in 4 ways, for example, as 18647809892721 + 1373211329281 = 4318311^2 + 1171841^2 .

It is not an unprimeable number, because it can be changed into a prime (20021021222003) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10152646693 + ... + 10152648664.

Almost surely, 2^{20021021222002} is an apocalyptic number.

20021021222002 is a deficient number, since it is larger than the sum of its proper divisors (12873557257958).

20021021222002 is a wasteful number, since it uses less digits than its factorization.

20021021222002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20305295405.

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 20021021222002 its reverse (20022212012002), we get a palindrome (40043233234004).

The spelling of 20021021222002 in words is "twenty trillion, twenty-one billion, twenty-one million, two hundred twenty-two thousand, two".