2121252144 has 40 divisors (see below), whose sum is σ = 5978075712. Its totient is φ = 642803520.

The previous prime is 2121252139. The next prime is 2121252151. The reversal of 2121252144 is 4412521212.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2008234 + ... + 2009289.

Almost surely, 2^2121252144 is an apocalyptic number.

2121252144 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

2121252144 is an abundant number, since it is smaller than the sum of its proper divisors (3856823568).

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

2121252144 is a wasteful number, since it uses less digits than its factorization.

2121252144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4017545 (or 4017539 counting only the distinct ones).

The product of its digits is 1280, while the sum is 24.

The square root of 2121252144 is about 46057.0531406429. The cubic root of 2121252144 is about 1284.8845236306.

Adding to 2121252144 its reverse (4412521212), we get a palindrome (6533773356).

The spelling of 2121252144 in words is "two billion, one hundred twenty-one million, two hundred fifty-two thousand, one hundred forty-four".