21011000220100 has 108 divisors (see below), whose sum is σ = 51995348490960. Its totient is φ = 7308173787200.

The previous prime is 21011000220073. The next prime is 21011000220113. The reversal of 21011000220100 is 102200011012.

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

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 in 35 ways as a sum of consecutive naturals, for example, 17471890 + ... + 18635689.

Almost surely, 2^{21011000220100} is an apocalyptic number.

21011000220100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21011000220100 is an abundant number, since it is smaller than the sum of its proper divisors (30984348270860).

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

21011000220100 is a wasteful number, since it uses less digits than its factorization.

21011000220100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36107650 (or 36107620 counting only the distinct ones).

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

Adding to 21011000220100 its reverse (102200011012), we get a palindrome (21113200231112).

The spelling of 21011000220100 in words is "twenty-one trillion, eleven billion, two hundred twenty thousand, one hundred".