1221021030 has 32 divisors (see below), whose sum is σ = 2937249504. Its totient is φ = 324850176.

The previous prime is 1221021007. The next prime is 1221021059. The reversal of 1221021030 is 301201221.

It is a junction number, because it is equal to n+sod(n) for n = 1221020997 and 1221021015.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34009 + ... + 59988.

It is an arithmetic number, because the mean of its divisors is an integer number (91789047).

Almost surely, 2^1221021030 is an apocalyptic number.

1221021030 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221021030 is an abundant number, since it is smaller than the sum of its proper divisors (1716228474).

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

1221021030 is a wasteful number, since it uses less digits than its factorization.

1221021030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94440.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 1221021030 is about 34943.1113382881. Note that the first 3 decimals coincide. The cubic root of 1221021030 is about 1068.8277347104.

Adding to 1221021030 its reverse (301201221), we get a palindrome (1522222251).

The spelling of 1221021030 in words is "one billion, two hundred twenty-one million, twenty-one thousand, thirty".