1221213030 has 96 divisors (see below), whose sum is σ = 3132829440. Its totient is φ = 303819840.

The previous prime is 1221213023. The next prime is 1221213053. The reversal of 1221213030 is 303121221.

It is a super-2 number, since 2×1221213030² = 2982722529283561800, which contains 22 as substring.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3926575 + ... + 3926885.

It is an arithmetic number, because the mean of its divisors is an integer number (32633640).

Almost surely, 2^1221213030 is an apocalyptic number.

1221213030 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1221213030, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1566414720).

1221213030 is an abundant number, since it is smaller than the sum of its proper divisors (1911616410).

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

1221213030 is a wasteful number, since it uses less digits than its factorization.

1221213030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 506 (or 423 counting only the distinct ones).

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

The square root of 1221213030 is about 34945.8585529101. The cubic root of 1221213030 is about 1068.8837545399.

Adding to 1221213030 its reverse (303121221), we get a palindrome (1524334251).

The spelling of 1221213030 in words is "one billion, two hundred twenty-one million, two hundred thirteen thousand, thirty".