20021200002100 has 36 divisors (see below), whose sum is σ = 47395640734848. Its totient is φ = 7280436364000.

The previous prime is 20021200002031. The next prime is 20021200002107. The reversal of 20021200002100 is 120000212002.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021200002107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9100544356 + ... + 9100546555.

It is an arithmetic number, because the mean of its divisors is an integer number (1316545575968).

Almost surely, 2^{20021200002100} is an apocalyptic number.

20021200002100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20021200002100 is an abundant number, since it is smaller than the sum of its proper divisors (27374440732748).

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

20021200002100 is a wasteful number, since it uses less digits than its factorization.

20021200002100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18201090936 (or 18201090929 counting only the distinct ones).

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

Adding to 20021200002100 its reverse (120000212002), we get a palindrome (20141200214102).

The spelling of 20021200002100 in words is "twenty trillion, twenty-one billion, two hundred million, two thousand, one hundred".