212001021020 has 48 divisors (see below), whose sum is σ = 449634931200. Its totient is φ = 83956474176.

The previous prime is 212001021017. The next prime is 212001021047. The reversal of 212001021020 is 20120100212.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 212001020992 and 212001021010.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10493849 + ... + 10514031.

It is an arithmetic number, because the mean of its divisors is an integer number (9367394400).

Almost surely, 2^212001021020 is an apocalyptic number.

212001021020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212001021020 is an abundant number, since it is smaller than the sum of its proper divisors (237633910180).

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

212001021020 is a wasteful number, since it uses less digits than its factorization.

212001021020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25394 (or 25392 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 212001021020 its reverse (20120100212), we get a palindrome (232121121232).

The spelling of 212001021020 in words is "two hundred twelve billion, one million, twenty-one thousand, twenty".