20021001102 has 24 divisors (see below), whose sum is σ = 43573368384. Its totient is φ = 6643738944.

The previous prime is 20021001079. The next prime is 20021001139. The reversal of 20021001102 is 20110012002.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2489883 + ... + 2497910.

It is an arithmetic number, because the mean of its divisors is an integer number (1815557016).

Almost surely, 2^20021001102 is an apocalyptic number.

20021001102 is an abundant number, since it is smaller than the sum of its proper divisors (23552367282).

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

20021001102 is a wasteful number, since it uses less digits than its factorization.

20021001102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4988024 (or 4988021 counting only the distinct ones).

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

Adding to 20021001102 its reverse (20110012002), we get a palindrome (40131013104).

The spelling of 20021001102 in words is "twenty billion, twenty-one million, one thousand, one hundred two".