1213100 has 36 divisors (see below), whose sum is σ = 3010224. Its totient is φ = 415680.

The previous prime is 1213097. The next prime is 1213109. The reversal of 1213100 is 13121.

It is a super-2 number, since 2×1213100² = 2943223220000, which contains 22 as substring.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (1213109) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 167 + ... + 1566.

2^1213100 is an apocalyptic number.

1213100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1213100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1505112).

1213100 is an abundant number, since it is smaller than the sum of its proper divisors (1797124).

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

1213100 is a wasteful number, since it uses less digits than its factorization.

1213100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1754 (or 1747 counting only the distinct ones).

The product of its (nonzero) digits is 6, while the sum is 8.

The square root of 1213100 is about 1101.4081895465. The cubic root of 1213100 is about 106.6511479159.

Adding to 1213100 its reverse (13121), we get a palindrome (1226221).

The spelling of 1213100 in words is "one million, two hundred thirteen thousand, one hundred".