221337381 has 32 divisors (see below), whose sum is σ = 310210560. Its totient is φ = 140272704.

The previous prime is 221337377. The next prime is 221337397. The reversal of 221337381 is 183733122.

221337381 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 221337381 - 2² = 221337377 is a prime.

It is a super-2 number, since 2×221337381² = 97980472455878322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221337371) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 841456 + ... + 841718.

It is an arithmetic number, because the mean of its divisors is an integer number (9694080).

Almost surely, 2^221337381 is an apocalyptic number.

It is an amenable number.

221337381 is a deficient number, since it is larger than the sum of its proper divisors (88873179).

221337381 is a wasteful number, since it uses less digits than its factorization.

221337381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 465.

The product of its digits is 6048, while the sum is 30.

The square root of 221337381 is about 14877.4117708693. The cubic root of 221337381 is about 604.9018632798.

The spelling of 221337381 in words is "two hundred twenty-one million, three hundred thirty-seven thousand, three hundred eighty-one".