1144002021 has 16 divisors (see below), whose sum is σ = 1578232320.
Its totient is φ = 736335360.
The previous prime is 1144001981. The next prime is 1144002023. The reversal of 1144002021 is 1202004411.
It is not a de Polignac number, because 1144002021 - 222 = 1139807717 is a prime.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (1144002023) by changing a digit.
It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26065 + ... + 54473.
It is an arithmetic number, because the mean of its divisors is an integer number (98639520).
Almost surely, 21144002021 is an apocalyptic number.
It is an amenable number.
1144002021 is a deficient number, since it is larger than the sum of its proper divisors (434230299).
1144002021 is a wasteful number, since it uses less digits than its factorization.
1144002021 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 28876.
The product of its (nonzero) digits is 64, while the sum is 15.
The square root of 1144002021 is about 33823.0989266211.
The cubic root of 1144002021 is about 1045.8649222284.
Adding to 1144002021 its reverse (1202004411), we get a palindrome (2346006432).
The spelling of 1144002021 in words is "one billion, one hundred forty-four million, two thousand, twenty-one".