1221142430220 has 192 divisors, whose sum is σ = 3803098521600. Its totient is φ = 291189133312.

The previous prime is 1221142430219. The next prime is 1221142430231. The reversal of 1221142430220 is 220342411221.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3320869 + ... + 3670211.

It is an arithmetic number, because the mean of its divisors is an integer number (19807804800).

Almost surely, 2^{1221142430220} is an apocalyptic number.

1221142430220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1221142430220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1901549260800).

1221142430220 is an abundant number, since it is smaller than the sum of its proper divisors (2581956091380).

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

1221142430220 is a wasteful number, since it uses less digits than its factorization.

1221142430220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 349544 (or 349542 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 24.

Adding to 1221142430220 its reverse (220342411221), we get a palindrome (1441484841441).

The spelling of 1221142430220 in words is "one trillion, two hundred twenty-one billion, one hundred forty-two million, four hundred thirty thousand, two hundred twenty".