1221012330 has 16 divisors (see below), whose sum is σ = 2930429664. Its totient is φ = 325603280.

The previous prime is 1221012319. The next prime is 1221012337. The reversal of 1221012330 is 332101221.

It is a super-2 number, since 2×1221012330² = 2981742220024057800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is not an unprimeable number, because it can be changed into a prime (1221012337) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20350176 + ... + 20350235.

It is an arithmetic number, because the mean of its divisors is an integer number (183151854).

Almost surely, 2^1221012330 is an apocalyptic number.

1221012330 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221012330 is an abundant number, since it is smaller than the sum of its proper divisors (1709417334).

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

1221012330 is a wasteful number, since it uses less digits than its factorization.

1221012330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40700421.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 1221012330 is about 34942.9868500104. The cubic root of 1221012330 is about 1068.8251961728.

Adding to 1221012330 its reverse (332101221), we get a palindrome (1553113551).

The spelling of 1221012330 in words is "one billion, two hundred twenty-one million, twelve thousand, three hundred thirty".