1211210012220 has 96 divisors (see below), whose sum is σ = 3844488506880. Its totient is φ = 282452209920.

The previous prime is 1211210012219. The next prime is 1211210012261. The reversal of 1211210012220 is 222100121121.

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

It is a self number, because there is not a number n which added to its sum of digits gives 1211210012220.

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, 40849216 + ... + 40878855.

It is an arithmetic number, because the mean of its divisors is an integer number (40046755280).

Almost surely, 2^{1211210012220} is an apocalyptic number.

1211210012220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211210012220 is an abundant number, since it is smaller than the sum of its proper divisors (2633278494660).

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

1211210012220 is a wasteful number, since it uses less digits than its factorization.

1211210012220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81728115 (or 81728113 counting only the distinct ones).

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

Adding to 1211210012220 its reverse (222100121121), we get a palindrome (1433310133341).

The spelling of 1211210012220 in words is "one trillion, two hundred eleven billion, two hundred ten million, twelve thousand, two hundred twenty".