2001421444 has 24 divisors (see below), whose sum is σ = 3822039648. Its totient is φ = 909464640.

The previous prime is 2001421439. The next prime is 2001421451. The reversal of 2001421444 is 4441241002.

It is a Harshad number since it is a multiple of its sum of digits (22).

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, 254272 + ... + 262024.

It is an arithmetic number, because the mean of its divisors is an integer number (159251652).

Almost surely, 2^2001421444 is an apocalyptic number.

It is an amenable number.

2001421444 is a deficient number, since it is larger than the sum of its proper divisors (1820618204).

2001421444 is a wasteful number, since it uses less digits than its factorization.

2001421444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13635 (or 13633 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 22.

The square root of 2001421444 is about 44737.2489543110. The cubic root of 2001421444 is about 1260.2194637457.

Adding to 2001421444 its reverse (4441241002), we get a palindrome (6442662446).

The spelling of 2001421444 in words is "two billion, one million, four hundred twenty-one thousand, four hundred forty-four".