21182010100 has 18 divisors (see below), whose sum is σ = 45964962134. Its totient is φ = 8472804000.

The previous prime is 21182010071. The next prime is 21182010127. The reversal of 21182010100 is 101028112.

It can be written as a sum of positive squares in 3 ways, for example, as 195272676 + 20986737424 = 13974^2 + 144868^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 105909951 + ... + 105910150.

Almost surely, 2^21182010100 is an apocalyptic number.

21182010100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21182010100 is an abundant number, since it is smaller than the sum of its proper divisors (24782952034).

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

21182010100 is a wasteful number, since it uses less digits than its factorization.

21182010100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211820115 (or 211820108 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21182010100 its reverse (101028112), we get a palindrome (21283038212).

The spelling of 21182010100 in words is "twenty-one billion, one hundred eighty-two million, ten thousand, one hundred".