1221031010 has 64 divisors (see below), whose sum is σ = 2391966720. Its totient is φ = 447249600.

The previous prime is 1221030997. The next prime is 1221031033. The reversal of 1221031010 is 101301221.

It is a junction number, because it is equal to n+sod(n) for n = 1221030982 and 1221031000.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 840785 + ... + 842235.

It is an arithmetic number, because the mean of its divisors is an integer number (37374480).

Almost surely, 2^1221031010 is an apocalyptic number.

1221031010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221031010 is a deficient number, since it is larger than the sum of its proper divisors (1170935710).

1221031010 is a wasteful number, since it uses less digits than its factorization.

1221031010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1623.

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 1221031010 is about 34943.2541415364. The cubic root of 1221031010 is about 1068.8306467192.

Adding to 1221031010 its reverse (101301221), we get a palindrome (1322332231).

The spelling of 1221031010 in words is "one billion, two hundred twenty-one million, thirty-one thousand, ten".