20001021010002 has 32 divisors (see below), whose sum is σ = 44494557076800. Its totient is φ = 6659830445184.

The previous prime is 20001021009997. The next prime is 20001021010037. The reversal of 20001021010002 is 20001012010002.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 199298208 + ... + 199398539.

It is an arithmetic number, because the mean of its divisors is an integer number (1390454908650).

Almost surely, 2^{20001021010002} is an apocalyptic number.

20001021010002 is an abundant number, since it is smaller than the sum of its proper divisors (24493536066798).

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

20001021010002 is a wasteful number, since it uses less digits than its factorization.

20001021010002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 398697687 (or 398697681 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 20001021010002 its reverse (20001012010002), we get a palindrome (40002033020004).

Subtracting from 20001021010002 its reverse (20001012010002), we obtain a square (9000000 = 3000²).

The spelling of 20001021010002 in words is "twenty trillion, one billion, twenty-one million, ten thousand, two".