1211011202220 has 48 divisors (see below), whose sum is σ = 3403436732640. Its totient is φ = 321735809536.

The previous prime is 1211011202201. The next prime is 1211011202227. The reversal of 1211011202220 is 222021101121.

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 1211011202220.

It is not an unprimeable number, because it can be changed into a prime (1211011202227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37499697 + ... + 37531976.

It is an arithmetic number, because the mean of its divisors is an integer number (70904931930).

Almost surely, 2^{1211011202220} is an apocalyptic number.

1211011202220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211011202220 is an abundant number, since it is smaller than the sum of its proper divisors (2192425530420).

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

1211011202220 is a wasteful number, since it uses less digits than its factorization.

1211011202220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75031954 (or 75031952 counting only the distinct ones).

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

Adding to 1211011202220 its reverse (222021101121), we get a palindrome (1433032303341).

The spelling of 1211011202220 in words is "one trillion, two hundred eleven billion, eleven million, two hundred two thousand, two hundred twenty".