2021011212220 has 144 divisors (see below), whose sum is σ = 5800161251808. Its totient is φ = 581469719040.

The previous prime is 2021011212203. The next prime is 2021011212223. The reversal of 2021011212220 is 222121101202.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 2021011212194 and 2021011212203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021011212223) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 7070547 + ... + 7350826.

It is an arithmetic number, because the mean of its divisors is an integer number (40278897582).

Almost surely, 2^{2021011212220} is an apocalyptic number.

2021011212220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2021011212220 is an abundant number, since it is smaller than the sum of its proper divisors (3779150039588).

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

2021011212220 is a wasteful number, since it uses less digits than its factorization.

2021011212220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14421420 (or 14421411 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 2021011212220 its reverse (222121101202), we get a palindrome (2243132313422).

The spelling of 2021011212220 in words is "two trillion, twenty-one billion, eleven million, two hundred twelve thousand, two hundred twenty".