211212111020 has 24 divisors (see below), whose sum is σ = 447936976368. Its totient is φ = 83648360000.

The previous prime is 211212111013. The next prime is 211212111029. The reversal of 211212111020 is 20111212112.

It is a super-2 number, since 2×211212111020² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 211212110986 and 211212111004.

It is not an unprimeable number, because it can be changed into a prime (211212111029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52278206 + ... + 52282245.

It is an arithmetic number, because the mean of its divisors is an integer number (18664040682).

Almost surely, 2^211212111020 is an apocalyptic number.

211212111020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211212111020 is an abundant number, since it is smaller than the sum of its proper divisors (236724865348).

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

211212111020 is a wasteful number, since it uses less digits than its factorization.

211212111020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104560561 (or 104560559 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 211212111020 its reverse (20111212112), we get a palindrome (231323323132).

The spelling of 211212111020 in words is "two hundred eleven billion, two hundred twelve million, one hundred eleven thousand, twenty".