21012202001100 has 72 divisors (see below), whose sum is σ = 60830105804608. Its totient is φ = 5600046369600.

The previous prime is 21012202001003. The next prime is 21012202001117. The reversal of 21012202001100 is 110020221012.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 19521886 + ... + 20570085.

Almost surely, 2^{21012202001100} is an apocalyptic number.

21012202001100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21012202001100 is an abundant number, since it is smaller than the sum of its proper divisors (39817903803508).

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

21012202001100 is a wasteful number, since it uses less digits than its factorization.

21012202001100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40093735 (or 40093728 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21012202001100 its reverse (110020221012), we get a palindrome (21122222222112).

The spelling of 21012202001100 in words is "twenty-one trillion, twelve billion, two hundred two million, one thousand, one hundred".