1220021101220 has 12 divisors (see below), whose sum is σ = 2562044312604. Its totient is φ = 488008440480.

The previous prime is 1220021101139. The next prime is 1220021101223. The reversal of 1220021101220 is 221011200221.

It can be written as a sum of positive squares in 2 ways, for example, as 444110285056 + 775910816164 = 666416^2 + 880858^2 .

It is a super-2 number, since 2×1220021101220² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1220021101195 and 1220021101204.

It is not an unprimeable number, because it can be changed into a prime (1220021101223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30500527511 + ... + 30500527550.

It is an arithmetic number, because the mean of its divisors is an integer number (213503692717).

Almost surely, 2^{1220021101220} is an apocalyptic number.

1220021101220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1220021101220 is an abundant number, since it is smaller than the sum of its proper divisors (1342023211384).

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

1220021101220 is a wasteful number, since it uses less digits than its factorization.

1220021101220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61001055070 (or 61001055068 counting only the distinct ones).

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

Adding to 1220021101220 its reverse (221011200221), we get a palindrome (1441032301441).

Subtracting from 1220021101220 its reverse (221011200221), we obtain a palindrome (999009900999).

The spelling of 1220021101220 in words is "one trillion, two hundred twenty billion, twenty-one million, one hundred one thousand, two hundred twenty".