21212000120100 has 144 divisors (see below), whose sum is σ = 61433833260800. Its totient is φ = 5650964766720.

The previous prime is 21212000120083. The next prime is 21212000120131. The reversal of 21212000120100 is 102100021212.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2832417156 + ... + 2832424644.

Almost surely, 2^{21212000120100} is an apocalyptic number.

21212000120100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21212000120100 is an abundant number, since it is smaller than the sum of its proper divisors (40221833140700).

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

21212000120100 is a wasteful number, since it uses less digits than its factorization.

21212000120100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15542 (or 15535 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21212000120100 its reverse (102100021212), we get a palindrome (21314100141312).

The spelling of 21212000120100 in words is "twenty-one trillion, two hundred twelve billion, one hundred twenty thousand, one hundred".