1244001021 has 8 divisors (see below), whose sum is σ = 1671330144. Its totient is φ = 823002960.

The previous prime is 1244001019. The next prime is 1244001053. The reversal of 1244001021 is 1201004421.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1244001021 - 2¹ = 1244001019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1244001091) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1582306 + ... + 1583091.

It is an arithmetic number, because the mean of its divisors is an integer number (208916268).

Almost surely, 2^1244001021 is an apocalyptic number.

It is an amenable number.

1244001021 is a deficient number, since it is larger than the sum of its proper divisors (427329123).

1244001021 is a wasteful number, since it uses less digits than its factorization.

1244001021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3165531.

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 1244001021 is about 35270.3986509934. The cubic root of 1244001021 is about 1075.4913264427.

Adding to 1244001021 its reverse (1201004421), we get a palindrome (2445005442).

The spelling of 1244001021 in words is "one billion, two hundred forty-four million, one thousand, twenty-one".