2021612644 has 12 divisors (see below), whose sum is σ = 3547846764. Its totient is φ = 1007942144.

The previous prime is 2021612627. The next prime is 2021612683. The reversal of 2021612644 is 4462161202.

It can be written as a sum of positive squares in 2 ways, for example, as 620607744 + 1401004900 = 24912^2 + 37430^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 714457 + ... + 717280.

It is an arithmetic number, because the mean of its divisors is an integer number (295653897).

Almost surely, 2^2021612644 is an apocalyptic number.

It is an amenable number.

2021612644 is a deficient number, since it is larger than the sum of its proper divisors (1526234120).

2021612644 is a wasteful number, since it uses less digits than its factorization.

2021612644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1432094 (or 1432092 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 28.

The square root of 2021612644 is about 44962.3469583161. The cubic root of 2021612644 is about 1264.4431704913.

Adding to 2021612644 its reverse (4462161202), we get a palindrome (6483773846).

The spelling of 2021612644 in words is "two billion, twenty-one million, six hundred twelve thousand, six hundred forty-four".