1213111000 has 64 divisors (see below), whose sum is σ = 2867024160. Its totient is φ = 480400000.

The previous prime is 1213110989. The next prime is 1213111021. The reversal of 1213111000 is 1113121.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 94995 + ... + 107005.

Almost surely, 2^1213111000 is an apocalyptic number.

1213111000 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 1213111000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1433512080).

1213111000 is an abundant number, since it is smaller than the sum of its proper divisors (1653913160).

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

1213111000 is a wasteful number, since it uses less digits than its factorization.

1213111000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12133 (or 12119 counting only the distinct ones).

The product of its (nonzero) digits is 6, while the sum is 10.

The square root of 1213111000 is about 34829.7430366634. The cubic root of 1213111000 is about 1066.5147027437.

Adding to 1213111000 its reverse (1113121), we get a palindrome (1214224121).

The spelling of 1213111000 in words is "one billion, two hundred thirteen million, one hundred eleven thousand".