1220421021220 has 24 divisors (see below), whose sum is σ = 2563759868544. Its totient is φ = 488001603936.

The previous prime is 1220421021199. The next prime is 1220421021283. The reversal of 1220421021220 is 221201240221.

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, 10365282 + ... + 10482361.

It is an arithmetic number, because the mean of its divisors is an integer number (106823327856).

Almost surely, 2^{1220421021220} is an apocalyptic number.

1220421021220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1220421021220 is an abundant number, since it is smaller than the sum of its proper divisors (1343338847324).

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

1220421021220 is a wasteful number, since it uses less digits than its factorization.

1220421021220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20850579 (or 20850577 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 1220421021220 its reverse (221201240221), we get a palindrome (1441622261441).

The spelling of 1220421021220 in words is "one trillion, two hundred twenty billion, four hundred twenty-one million, twenty-one thousand, two hundred twenty".