1213121130 has 32 divisors (see below), whose sum is σ = 3135452544. Its totient is φ = 298614336.

The previous prime is 1213121113. The next prime is 1213121137. The reversal of 1213121130 is 311213121.

It is a happy number.

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 (1213121137) 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 15 ways as a sum of consecutive naturals, for example, 1554894 + ... + 1555673.

It is an arithmetic number, because the mean of its divisors is an integer number (97982892).

Almost surely, 2^1213121130 is an apocalyptic number.

1213121130 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1213121130 is an abundant number, since it is smaller than the sum of its proper divisors (1922331414).

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

1213121130 is a wasteful number, since it uses less digits than its factorization.

1213121130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3110590.

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 1213121130 is about 34829.8884580471. Note that the first 3 decimals coincide. The cubic root of 1213121130 is about 1066.5176713546.

Adding to 1213121130 its reverse (311213121), we get a palindrome (1524334251).

It can be divided in two parts, 121 and 3121130, that added together give a triangular number (3121251 = T₂₄₉₈).

The spelling of 1213121130 in words is "one billion, two hundred thirteen million, one hundred twenty-one thousand, one hundred thirty".