211211101220 has 48 divisors (see below), whose sum is σ = 508791144960. Its totient is φ = 72146020224.

The previous prime is 211211101183. The next prime is 211211101237. The reversal of 211211101220 is 22101112112.

It is a super-2 number, since 2×211211101220² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a junction number, because it is equal to n+sod(n) for n = 211211101195 and 211211101204.

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, 2766524 + ... + 2841843.

It is an arithmetic number, because the mean of its divisors is an integer number (10599815520).

Almost surely, 2^211211101220 is an apocalyptic number.

211211101220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211211101220 is an abundant number, since it is smaller than the sum of its proper divisors (297580043740).

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

211211101220 is a wasteful number, since it uses less digits than its factorization.

211211101220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5608652 (or 5608650 counting only the distinct ones).

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

Adding to 211211101220 its reverse (22101112112), we get a palindrome (233312213332).

The spelling of 211211101220 in words is "two hundred eleven billion, two hundred eleven million, one hundred one thousand, two hundred twenty".