20011021102 has 4 divisors (see below), whose sum is σ = 30016531656. Its totient is φ = 10005510550.

The previous prime is 20011021099. The next prime is 20011021109. The reversal of 20011021102 is 20112011002.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20011021109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5002755274 + ... + 5002755277.

It is an arithmetic number, because the mean of its divisors is an integer number (7504132914).

Almost surely, 2^20011021102 is an apocalyptic number.

20011021102 is a deficient number, since it is larger than the sum of its proper divisors (10005510554).

20011021102 is a wasteful number, since it uses less digits than its factorization.

20011021102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10005510553.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 20011021102 its reverse (20112011002), we get a palindrome (40123032104).

The spelling of 20011021102 in words is "twenty billion, eleven million, twenty-one thousand, one hundred two".