1221204930 has 64 divisors (see below), whose sum is σ = 3201164928. Its totient is φ = 295695360.

The previous prime is 1221204893. The next prime is 1221204931. The reversal of 1221204930 is 394021221.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1221204930.

It is not an unprimeable number, because it can be changed into a prime (1221204931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 366954 + ... + 370266.

It is an arithmetic number, because the mean of its divisors is an integer number (50018202).

Almost surely, 2^1221204930 is an apocalyptic number.

1221204930 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221204930 is an abundant number, since it is smaller than the sum of its proper divisors (1979959998).

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

1221204930 is a wasteful number, since it uses less digits than its factorization.

1221204930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4451.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 1221204930 is about 34945.7426591566. The cubic root of 1221204930 is about 1068.8813913220.

The spelling of 1221204930 in words is "one billion, two hundred twenty-one million, two hundred four thousand, nine hundred thirty".