20021320320002 has 8 divisors (see below), whose sum is σ = 31798567567116. Its totient is φ = 9421797797632.

The previous prime is 20021320319983. The next prime is 20021320320013. The reversal of 20021320320002 is 20002302312002.

It can be written as a sum of positive squares in 2 ways, for example, as 18965685311521 + 1055635008481 = 4354961^2 + 1027441^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×20021320320002² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 294431181143 + ... + 294431181210.

Almost surely, 2^{20021320320002} is an apocalyptic number.

20021320320002 is a deficient number, since it is larger than the sum of its proper divisors (11777247247114).

20021320320002 is a wasteful number, since it uses less digits than its factorization.

20021320320002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 588862362372.

The product of its (nonzero) digits is 288, while the sum is 17.

Adding to 20021320320002 its reverse (20002302312002), we get a palindrome (40023622632004).

The spelling of 20021320320002 in words is "twenty trillion, twenty-one billion, three hundred twenty million, three hundred twenty thousand, two".