20021011102 has 4 divisors (see below), whose sum is σ = 30031516656. Its totient is φ = 10010505550.

The previous prime is 20021011091. The next prime is 20021011103. The reversal of 20021011102 is 20111012002.

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 (20021011103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5005252774 + ... + 5005252777.

It is an arithmetic number, because the mean of its divisors is an integer number (7507879164).

Almost surely, 2^20021011102 is an apocalyptic number.

20021011102 is a deficient number, since it is larger than the sum of its proper divisors (10010505554).

20021011102 is a wasteful number, since it uses less digits than its factorization.

20021011102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10010505553.

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

Adding to 20021011102 its reverse (20111012002), we get a palindrome (40132023104).

The spelling of 20021011102 in words is "twenty billion, twenty-one million, eleven thousand, one hundred two".