1801137221 has 16 divisors (see below), whose sum is σ = 1955681280. Its totient is φ = 1648940160.

The previous prime is 1801137203. The next prime is 1801137223. The reversal of 1801137221 is 1227311081.

It is a cyclic number.

It is not a de Polignac number, because 1801137221 - 2⁶ = 1801137157 is a prime.

It is a super-3 number, since 3×1801137221³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1801137223) 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, 872036 + ... + 874098.

It is an arithmetic number, because the mean of its divisors is an integer number (122230080).

Almost surely, 2^1801137221 is an apocalyptic number.

It is an amenable number.

1801137221 is a deficient number, since it is larger than the sum of its proper divisors (154544059).

1801137221 is a wasteful number, since it uses less digits than its factorization.

1801137221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2596.

The product of its (nonzero) digits is 672, while the sum is 26.

The square root of 1801137221 is about 42439.8070330203. The cubic root of 1801137221 is about 1216.6965232514.

The spelling of 1801137221 in words is "one billion, eight hundred one million, one hundred thirty-seven thousand, two hundred twenty-one".