212121010100100 has 36 divisors (see below), whose sum is σ = 613736789223824. Its totient is φ = 56565602693280.

The previous prime is 212121010100047. The next prime is 212121010100179. The reversal of 212121010100100 is 1001010121212.

It is a super-3 number, since 3×212121010100100³ (a number of 44 digits) contains 333 as substring.

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 11 ways as a sum of consecutive naturals, for example, 353535016534 + ... + 353535017133.

Almost surely, 2^{212121010100100} is an apocalyptic number.

212121010100100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212121010100100 is an abundant number, since it is smaller than the sum of its proper divisors (401615779123724).

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

212121010100100 is a wasteful number, since it uses less digits than its factorization.

212121010100100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 707070033684 (or 707070033677 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 212121010100100 its reverse (1001010121212), we get a palindrome (213122020221312).

The spelling of 212121010100100 in words is "two hundred twelve trillion, one hundred twenty-one billion, ten million, one hundred thousand, one hundred".