2126401644 has 24 divisors (see below), whose sum is σ = 5222741440. Its totient is φ = 671495184.

The previous prime is 2126401621. The next prime is 2126401657. The reversal of 2126401644 is 4461046212.

It is a happy number.

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, 4662934 + ... + 4663389.

Almost surely, 2^2126401644 is an apocalyptic number.

It is an amenable number.

2126401644 is an abundant number, since it is smaller than the sum of its proper divisors (3096339796).

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

2126401644 is a wasteful number, since it uses less digits than its factorization.

2126401644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9326349 (or 9326347 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 30.

The square root of 2126401644 is about 46112.9227440638. The cubic root of 2126401644 is about 1285.9234015490.

Adding to 2126401644 its reverse (4461046212), we get a palindrome (6587447856).

The spelling of 2126401644 in words is "two billion, one hundred twenty-six million, four hundred one thousand, six hundred forty-four".