211021221012020 has 48 divisors (see below), whose sum is σ = 444178423180800. Its totient is φ = 84211567887360.

The previous prime is 211021221011977. The next prime is 211021221012059. The reversal of 211021221012020 is 20210122120112.

It is a self number, because there is not a number n which added to its sum of digits gives 211021221012020.

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, 1300840676 + ... + 1301002884.

It is an arithmetic number, because the mean of its divisors is an integer number (9253717149600).

Almost surely, 2^{211021221012020} is an apocalyptic number.

211021221012020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211021221012020 is an abundant number, since it is smaller than the sum of its proper divisors (233157202168780).

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

211021221012020 is a wasteful number, since it uses less digits than its factorization.

211021221012020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 313568 (or 313566 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 211021221012020 its reverse (20210122120112), we get a palindrome (231231343132132).

The spelling of 211021221012020 in words is "two hundred eleven trillion, twenty-one billion, two hundred twenty-one million, twelve thousand, twenty".