212210400420 has 48 divisors (see below), whose sum is σ = 660210136320. Its totient is φ = 56589439968.

The previous prime is 212210400361. The next prime is 212210400421. The reversal of 212210400420 is 24004012212.

212210400420 is a `hidden beast` number, since 2 + 1 + 221 + 0 + 400 + 42 + 0 = 666.

212210400420 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a junction number, because it is equal to n+sod(n) for n = 212210400393 and 212210400402.

It is not an unprimeable number, because it can be changed into a prime (212210400421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 196490572 + ... + 196491651.

It is an arithmetic number, because the mean of its divisors is an integer number (13754377840).

Almost surely, 2^212210400420 is an apocalyptic number.

212210400420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212210400420 is an abundant number, since it is smaller than the sum of its proper divisors (447999735900).

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

212210400420 is a wasteful number, since it uses less digits than its factorization.

212210400420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 392982241 (or 392982233 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 212210400420 its reverse (24004012212), we get a palindrome (236214412632).

The spelling of 212210400420 in words is "two hundred twelve billion, two hundred ten million, four hundred thousand, four hundred twenty".