2113121000 has 64 divisors (see below), whose sum is σ = 4952610000. Its totient is φ = 843897600.

The previous prime is 2113120963. The next prime is 2113121027. The reversal of 2113121000 is 1213112.

It can be written as a sum of positive squares in 8 ways, for example, as 435890884 + 1677230116 = 20878^2 + 40954^2 .

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, 827726 + ... + 830274.

Almost surely, 2^2113121000 is an apocalyptic number.

2113121000 is a gapful number since it is divisible by the number (20) 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 2113121000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2476305000).

2113121000 is an abundant number, since it is smaller than the sum of its proper divisors (2839489000).

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

2113121000 is a wasteful number, since it uses less digits than its factorization.

2113121000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3399 (or 3385 counting only the distinct ones).

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

The square root of 2113121000 is about 45968.6958701245. The cubic root of 2113121000 is about 1283.2406897010.

Adding to 2113121000 its reverse (1213112), we get a palindrome (2114334112).

The spelling of 2113121000 in words is "two billion, one hundred thirteen million, one hundred twenty-one thousand".