1221501030 has 16 divisors (see below), whose sum is σ = 2931602544. Its totient is φ = 325733600.

The previous prime is 1221501023. The next prime is 1221501067. The reversal of 1221501030 is 301051221.

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

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 20358321 + ... + 20358380.

It is an arithmetic number, because the mean of its divisors is an integer number (183225159).

Almost surely, 2^1221501030 is an apocalyptic number.

1221501030 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221501030 is an abundant number, since it is smaller than the sum of its proper divisors (1710101514).

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

1221501030 is a wasteful number, since it uses less digits than its factorization.

1221501030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40716711.

The product of its (nonzero) digits is 60, while the sum is 15.

The square root of 1221501030 is about 34949.9789699508. The cubic root of 1221501030 is about 1068.9677732758.

Adding to 1221501030 its reverse (301051221), we get a palindrome (1522552251).

The spelling of 1221501030 in words is "one billion, two hundred twenty-one million, five hundred one thousand, thirty".