1221012310 has 32 divisors (see below), whose sum is σ = 2535287040. Its totient is φ = 414717792.

The previous prime is 1221012307. The next prime is 1221012313. The reversal of 1221012310 is 132101221.

It is an interprime number because it is at equal distance from previous prime (1221012307) and next prime (1221012313).

It is a super-2 number, since 2×1221012310² = 2981742122343072200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221012313) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 74020 + ... + 88999.

It is an arithmetic number, because the mean of its divisors is an integer number (79227720).

Almost surely, 2^1221012310 is an apocalyptic number.

1221012310 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221012310 is an abundant number, since it is smaller than the sum of its proper divisors (1314274730).

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

1221012310 is a wasteful number, since it uses less digits than its factorization.

1221012310 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163140.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 1221012310 is about 34942.9865638299. The cubic root of 1221012310 is about 1068.8251903371.

Adding to 1221012310 its reverse (132101221), we get a palindrome (1353113531).

The spelling of 1221012310 in words is "one billion, two hundred twenty-one million, twelve thousand, three hundred ten".