20021200102 has 4 divisors (see below), whose sum is σ = 30031800156. Its totient is φ = 10010600050.

The previous prime is 20021200081. The next prime is 20021200117. The reversal of 20021200102 is 20100212002.

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

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5005300024 + ... + 5005300027.

It is an arithmetic number, because the mean of its divisors is an integer number (7507950039).

Almost surely, 2^20021200102 is an apocalyptic number.

20021200102 is a deficient number, since it is larger than the sum of its proper divisors (10010600054).

20021200102 is a wasteful number, since it uses less digits than its factorization.

20021200102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10010600053.

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 20021200102 its reverse (20100212002), we get a palindrome (40121412104).

The spelling of 20021200102 in words is "twenty billion, twenty-one million, two hundred thousand, one hundred two".