211011101220 has 48 divisors (see below), whose sum is σ = 590872601088. Its totient is φ = 56265672960.

The previous prime is 211011101183. The next prime is 211011101233. The reversal of 211011101220 is 22101110112.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 211011101196 and 211011101205.

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, 793677 + ... + 1025643.

It is an arithmetic number, because the mean of its divisors is an integer number (12309845856).

Almost surely, 2^211011101220 is an apocalyptic number.

211011101220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211011101220 is an abundant number, since it is smaller than the sum of its proper divisors (379861499868).

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

211011101220 is a wasteful number, since it uses less digits than its factorization.

211011101220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247140 (or 247138 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 211011101220 its reverse (22101110112), we get a palindrome (233112211332).

The spelling of 211011101220 in words is "two hundred eleven billion, eleven million, one hundred one thousand, two hundred twenty".