1221131030 has 32 divisors (see below), whose sum is σ = 2513588544. Its totient is φ = 418415616.

The previous prime is 1221131027. The next prime is 1221131039. The reversal of 1221131030 is 301311221.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a junction number, because it is equal to n+sod(n) for n = 1221130996 and 1221131014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221131039) 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, 135134 + ... + 143886.

It is an arithmetic number, because the mean of its divisors is an integer number (78549642).

Almost surely, 2^1221131030 is an apocalyptic number.

1221131030 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221131030 is an abundant number, since it is smaller than the sum of its proper divisors (1292457514).

1221131030 is a wasteful number, since it uses less digits than its factorization.

1221131030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10760.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 1221131030 is about 34944.6852897547. The cubic root of 1221131030 is about 1068.8598301228.

Adding to 1221131030 its reverse (301311221), we get a palindrome (1522442251).

The spelling of 1221131030 in words is "one billion, two hundred twenty-one million, one hundred thirty-one thousand, thirty".