212001660420 has 48 divisors (see below), whose sum is σ = 647568710208. Its totient is φ = 51394341760.

The previous prime is 212001660383. The next prime is 212001660421. The reversal of 212001660420 is 24066100212.

It is not an unprimeable number, because it can be changed into a prime (212001660421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 160606659 + ... + 160607978.

It is an arithmetic number, because the mean of its divisors is an integer number (13491014796).

Almost surely, 2^212001660420 is an apocalyptic number.

212001660420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212001660420 is an abundant number, since it is smaller than the sum of its proper divisors (435567049788).

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

212001660420 is a wasteful number, since it uses less digits than its factorization.

212001660420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321214660 (or 321214658 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

Adding to 212001660420 its reverse (24066100212), we get a palindrome (236067760632).

The spelling of 212001660420 in words is "two hundred twelve billion, one million, six hundred sixty thousand, four hundred twenty".