1221011200220 has 48 divisors (see below), whose sum is σ = 3084659880960. Its totient is φ = 396599125824.

The previous prime is 1221011200187. The next prime is 1221011200231. The reversal of 1221011200220 is 220021101221.

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 = 1221011200195 and 1221011200204.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 229510724 + ... + 229516043.

It is an arithmetic number, because the mean of its divisors is an integer number (64263747520).

Almost surely, 2^{1221011200220} is an apocalyptic number.

1221011200220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221011200220 is an abundant number, since it is smaller than the sum of its proper divisors (1863648680740).

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

1221011200220 is a wasteful number, since it uses less digits than its factorization.

1221011200220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 459026802 (or 459026800 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 1221011200220 its reverse (220021101221), we get a palindrome (1441032301441).

The spelling of 1221011200220 in words is "one trillion, two hundred twenty-one billion, eleven million, two hundred thousand, two hundred twenty".