1211211012220 has 48 divisors (see below), whose sum is σ = 2775550984416. Its totient is φ = 440317088000.

The previous prime is 1211211012197. The next prime is 1211211012259. The reversal of 1211211012220 is 222101121121.

It is a super-2 number, since 2×1211211012220² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1211211012194 and 1211211012203.

It is a congruent number.

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, 19110 + ... + 1556530.

It is an arithmetic number, because the mean of its divisors is an integer number (57823978842).

Almost surely, 2^{1211211012220} is an apocalyptic number.

1211211012220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211211012220 is an abundant number, since it is smaller than the sum of its proper divisors (1564339972196).

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

1211211012220 is a wasteful number, since it uses less digits than its factorization.

1211211012220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1541022 (or 1541020 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 1211211012220 its reverse (222101121121), we get a palindrome (1433312133341).

The spelling of 1211211012220 in words is "one trillion, two hundred eleven billion, two hundred eleven million, twelve thousand, two hundred twenty".