211221210001020 has 96 divisors (see below), whose sum is σ = 591676488539136. Its totient is φ = 56301175660800.

The previous prime is 211221210001003. The next prime is 211221210001033. The reversal of 211221210001020 is 20100012122112.

It is a super-2 number, since 2×211221210001020² (a number of 29 digits) contains 22 as substring.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1318890150 + ... + 1319050290.

It is an arithmetic number, because the mean of its divisors is an integer number (6163296755616).

Almost surely, 2^{211221210001020} is an apocalyptic number.

211221210001020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211221210001020 is an abundant number, since it is smaller than the sum of its proper divisors (380455278538116).

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

211221210001020 is a wasteful number, since it uses less digits than its factorization.

211221210001020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169571 (or 169569 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 211221210001020 its reverse (20100012122112), we get a palindrome (231321222123132).

The spelling of 211221210001020 in words is "two hundred eleven trillion, two hundred twenty-one billion, two hundred ten million, one thousand, twenty".