20021311321002 has 64 divisors (see below), whose sum is σ = 45545544115200. Its totient is φ = 6517207479600.

The previous prime is 20021311320991. The next prime is 20021311321009. The reversal of 20021311321002 is 20012311312002.

20021311321002 is a `hidden beast` number, since 200 + 21 + 311 + 32 + 100 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (20021311321009) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20327368 + ... + 21289539.

It is an arithmetic number, because the mean of its divisors is an integer number (711649126800).

Almost surely, 2^{20021311321002} is an apocalyptic number.

20021311321002 is an abundant number, since it is smaller than the sum of its proper divisors (25524232794198).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20021311321002 is a wasteful number, since it uses less digits than its factorization.

20021311321002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41617128 (or 41617122 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 20021311321002 its reverse (20012311312002), we get a palindrome (40033622633004).

The spelling of 20021311321002 in words is "twenty trillion, twenty-one billion, three hundred eleven million, three hundred twenty-one thousand, two".