21120002010100 has 36 divisors (see below), whose sum is σ = 52377604986784. Its totient is φ = 7241143546080.

The previous prime is 21120002010091. The next prime is 21120002010101. The reversal of 21120002010100 is 101020002112.

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 (21120002010101) 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, 15085715022 + ... + 15085716421.

Almost surely, 2^{21120002010100} is an apocalyptic number.

21120002010100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21120002010100 is an abundant number, since it is smaller than the sum of its proper divisors (31257602976684).

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

21120002010100 is a wasteful number, since it uses less digits than its factorization.

21120002010100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30171431464 (or 30171431457 counting only the distinct ones).

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

Adding to 21120002010100 its reverse (101020002112), we get a palindrome (21221022012212).

The spelling of 21120002010100 in words is "twenty-one trillion, one hundred twenty billion, two million, ten thousand, one hundred".