1211222000220 has 24 divisors (see below), whose sum is σ = 3391421600784. Its totient is φ = 322992533376.

The previous prime is 1211222000207. The next prime is 1211222000243. The reversal of 1211222000220 is 220002221121.

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 1211222000220.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10093516609 + ... + 10093516728.

It is an arithmetic number, because the mean of its divisors is an integer number (141309233366).

Almost surely, 2^{1211222000220} is an apocalyptic number.

1211222000220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211222000220 is an abundant number, since it is smaller than the sum of its proper divisors (2180199600564).

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

1211222000220 is a wasteful number, since it uses less digits than its factorization.

1211222000220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20187033349 (or 20187033347 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 1211222000220 its reverse (220002221121), we get a palindrome (1431224221341).

The spelling of 1211222000220 in words is "one trillion, two hundred eleven billion, two hundred twenty-two million, two hundred twenty", and thus it is an aban number.