1221010101030 has 128 divisors (see below), whose sum is σ = 3120448582656. Its totient is φ = 304709529600.

The previous prime is 1221010101029. The next prime is 1221010101061. The reversal of 1221010101030 is 301010101221.

It is a junction number, because it is equal to n+sod(n) for n = 1221010100997 and 1221010101015.

It is a congruent number.

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, 128373975 + ... + 128383485.

It is an arithmetic number, because the mean of its divisors is an integer number (24378504552).

Almost surely, 2^{1221010101030} is an apocalyptic number.

1221010101030 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1221010101030, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1560224291328).

1221010101030 is an abundant number, since it is smaller than the sum of its proper divisors (1899438481626).

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

1221010101030 is a wasteful number, since it uses less digits than its factorization.

1221010101030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10942.

The product of its (nonzero) digits is 12, while the sum is 12.

Adding to 1221010101030 its reverse (301010101221), we get a palindrome (1522020202251).

The spelling of 1221010101030 in words is "one trillion, two hundred twenty-one billion, ten million, one hundred one thousand, thirty".