212220021212100 has 216 divisors, whose sum is σ = 725978208795840. Its totient is φ = 51424991136000.

The previous prime is 212220021212047. The next prime is 212220021212117. The reversal of 212220021212100 is 1212120022212.

It is a happy number.

212220021212100 is a `hidden beast` number, since 21 + 2 + 220 + 0 + 212 + 1 + 210 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 18217185 + ... + 27501015.

Almost surely, 2^{212220021212100} is an apocalyptic number.

212220021212100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 212220021212100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (362989104397920).

212220021212100 is an abundant number, since it is smaller than the sum of its proper divisors (513758187583740).

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

212220021212100 is a wasteful number, since it uses less digits than its factorization.

212220021212100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9286171 (or 9286161 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 212220021212100 its reverse (1212120022212), we get a palindrome (213432141234312).

The spelling of 212220021212100 in words is "two hundred twelve trillion, two hundred twenty billion, twenty-one million, two hundred twelve thousand, one hundred".