21120100020100 has 36 divisors (see below), whose sum is σ = 46036135554304. Its totient is φ = 8410156411680.

The previous prime is 21120100020079. The next prime is 21120100020101. The reversal of 21120100020100 is 102000102112.

It is a super-3 number, since 3×21120100020100³ (a number of 41 digits) contains 333 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (21120100020101) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 473522544 + ... + 473567143.

Almost surely, 2^{21120100020100} is an apocalyptic number.

21120100020100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21120100020100 is an abundant number, since it is smaller than the sum of its proper divisors (24916035534204).

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

21120100020100 is a wasteful number, since it uses less digits than its factorization.

21120100020100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 947089924 (or 947089917 counting only the distinct ones).

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

Adding to 21120100020100 its reverse (102000102112), we get a palindrome (21222100122212).

The spelling of 21120100020100 in words is "twenty-one trillion, one hundred twenty billion, one hundred million, twenty thousand, one hundred".