2121154000 has 160 divisors (see below), whose sum is σ = 5912764416. Its totient is φ = 720921600.

The previous prime is 2121153973. The next prime is 2121154003. The reversal of 2121154000 is 4511212.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121154003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1777404 + ... + 1778596.

Almost surely, 2^2121154000 is an apocalyptic number.

2121154000 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 2121154000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2956382208).

2121154000 is an abundant number, since it is smaller than the sum of its proper divisors (3791610416).

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

2121154000 is a wasteful number, since it uses less digits than its factorization.

2121154000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1350 (or 1334 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 2121154000 is about 46055.9876671861. The cubic root of 2121154000 is about 1284.8647074021.

Adding to 2121154000 its reverse (4511212), we get a palindrome (2125665212).

The spelling of 2121154000 in words is "two billion, one hundred twenty-one million, one hundred fifty-four thousand".