20212001201220 has 48 divisors (see below), whose sum is σ = 56593847059008. Its totient is φ = 5389843777920.

The previous prime is 20212001201179. The next prime is 20212001201221. The reversal of 20212001201220 is 2210210021202.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 20212001201220.

It is not an unprimeable number, because it can be changed into a prime (20212001201221) 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, 16840710 + ... + 18000930.

It is an arithmetic number, because the mean of its divisors is an integer number (1179038480396).

Almost surely, 2^{20212001201220} is an apocalyptic number.

20212001201220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20212001201220 is an abundant number, since it is smaller than the sum of its proper divisors (36381845857788).

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

20212001201220 is a wasteful number, since it uses less digits than its factorization.

20212001201220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1450580 (or 1450578 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 20212001201220 its reverse (2210210021202), we get a palindrome (22422211222422).

The spelling of 20212001201220 in words is "twenty trillion, two hundred twelve billion, one million, two hundred one thousand, two hundred twenty".