211221012012020 has 24 divisors (see below), whose sum is σ = 443840145283584. Its totient is φ = 84435829555616.

The previous prime is 211221012011941. The next prime is 211221012012053. The reversal of 211221012012020 is 20210210122112.

It is a super-2 number, since 2×211221012012020² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 211221012012020.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3285920132 + ... + 3285984411.

It is an arithmetic number, because the mean of its divisors is an integer number (18493339386816).

Almost surely, 2^{211221012012020} is an apocalyptic number.

211221012012020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211221012012020 is an abundant number, since it is smaller than the sum of its proper divisors (232619133271564).

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

211221012012020 is a wasteful number, since it uses less digits than its factorization.

211221012012020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6571906159 (or 6571906157 counting only the distinct ones).

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

Adding to 211221012012020 its reverse (20210210122112), we get a palindrome (231431222134132).

The spelling of 211221012012020 in words is "two hundred eleven trillion, two hundred twenty-one billion, twelve million, twelve thousand, twenty".