2121251154 has 32 divisors (see below), whose sum is σ = 4629980736. Its totient is φ = 642553920.

The previous prime is 2121251129. The next prime is 2121251159. The reversal of 2121251154 is 4511521212.

It is a happy number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2121251159) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 235624 + ... + 244460.

It is an arithmetic number, because the mean of its divisors is an integer number (144686898).

Almost surely, 2^2121251154 is an apocalyptic number.

2121251154 is an abundant number, since it is smaller than the sum of its proper divisors (2508729582).

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

2121251154 is a wasteful number, since it uses less digits than its factorization.

2121251154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12490.

The product of its digits is 800, while the sum is 24.

The square root of 2121251154 is about 46057.0423931021. The cubic root of 2121251154 is about 1284.8843237430.

Adding to 2121251154 its reverse (4511521212), we get a palindrome (6632772366).

The spelling of 2121251154 in words is "two billion, one hundred twenty-one million, two hundred fifty-one thousand, one hundred fifty-four".