1211013000 has 192 divisors, whose sum is σ = 4117651200. Its totient is φ = 321014400.

The previous prime is 1211012821. The next prime is 1211013031. The reversal of 1211013000 is 3101121.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 2150719 + ... + 2151281.

It is an arithmetic number, because the mean of its divisors is an integer number (21446100).

Almost surely, 2^1211013000 is an apocalyptic number.

1211013000 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 1211013000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2058825600).

1211013000 is an abundant number, since it is smaller than the sum of its proper divisors (2906638200).

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

1211013000 is a wasteful number, since it uses less digits than its factorization.

1211013000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 829 (or 812 counting only the distinct ones).

The product of its (nonzero) digits is 6, while the sum is 9.

The square root of 1211013000 is about 34799.6120668033. The cubic root of 1211013000 is about 1065.8995243615.

Adding to 1211013000 its reverse (3101121), we get a palindrome (1214114121).

The spelling of 1211013000 in words is "one billion, two hundred eleven million, thirteen thousand".