1213100120 has 16 divisors (see below), whose sum is σ = 2729475360. Its totient is φ = 485240032.

The previous prime is 1213100117. The next prime is 1213100123. The reversal of 1213100120 is 210013121.

It is an interprime number because it is at equal distance from previous prime (1213100117) and next prime (1213100123).

It is a super-2 number, since 2×1213100120² = 2943223802288028800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213100123) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15163712 + ... + 15163791.

It is an arithmetic number, because the mean of its divisors is an integer number (170592210).

Almost surely, 2^1213100120 is an apocalyptic number.

1213100120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1213100120 is an abundant number, since it is smaller than the sum of its proper divisors (1516375240).

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

1213100120 is a wasteful number, since it uses less digits than its factorization.

1213100120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30327514 (or 30327510 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 1213100120 is about 34829.5868479659. The cubic root of 1213100120 is about 1066.5115143257.

Adding to 1213100120 its reverse (210013121), we get a palindrome (1423113241).

The spelling of 1213100120 in words is "one billion, two hundred thirteen million, one hundred thousand, one hundred twenty".