20011220102 has 4 divisors (see below), whose sum is σ = 30016830156. Its totient is φ = 10005610050.

The previous prime is 20011220093. The next prime is 20011220113. The reversal of 20011220102 is 20102211002.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5002805024 + ... + 5002805027.

It is an arithmetic number, because the mean of its divisors is an integer number (7504207539).

Almost surely, 2^20011220102 is an apocalyptic number.

20011220102 is a deficient number, since it is larger than the sum of its proper divisors (10005610054).

20011220102 is a wasteful number, since it uses less digits than its factorization.

20011220102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10005610053.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 20011220102 its reverse (20102211002), we get a palindrome (40113431104).

The spelling of 20011220102 in words is "twenty billion, eleven million, two hundred twenty thousand, one hundred two".