21211230100 has 18 divisors (see below), whose sum is σ = 46028369534. Its totient is φ = 8484492000.

The previous prime is 21211230091. The next prime is 21211230107. The reversal of 21211230100 is 103211212.

It can be written as a sum of positive squares in 3 ways, for example, as 1342636164 + 19868593936 = 36642^2 + 140956^2 .

It is a super-3 number, since 3×21211230100³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21211230107) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 106056051 + ... + 106056250.

Almost surely, 2^21211230100 is an apocalyptic number.

21211230100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21211230100 is an abundant number, since it is smaller than the sum of its proper divisors (24817139434).

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

21211230100 is a wasteful number, since it uses less digits than its factorization.

21211230100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212112315 (or 212112308 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 21211230100 its reverse (103211212), we get a palindrome (21314441312).

The spelling of 21211230100 in words is "twenty-one billion, two hundred eleven million, two hundred thirty thousand, one hundred".