221890539 has 16 divisors (see below), whose sum is σ = 322649600. Its totient is φ = 134817696.

The previous prime is 221890481. The next prime is 221890541. The reversal of 221890539 is 935098122.

It is not a de Polignac number, because 221890539 - 2¹² = 221886443 is a prime.

It is a super-2 number, since 2×221890539² = 98470822595421042, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a junction number, because it is equal to n+sod(n) for n = 221890497 and 221890506.

It is not an unprimeable number, because it can be changed into a prime (221890589) 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, 32929 + ... + 39090.

It is an arithmetic number, because the mean of its divisors is an integer number (20165600).

Almost surely, 2^221890539 is an apocalyptic number.

221890539 is a deficient number, since it is larger than the sum of its proper divisors (100759061).

221890539 is a wasteful number, since it uses less digits than its factorization.

221890539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72114.

The product of its (nonzero) digits is 38880, while the sum is 39.

The square root of 221890539 is about 14895.9907021990. The cubic root of 221890539 is about 605.4053600150.

The spelling of 221890539 in words is "two hundred twenty-one million, eight hundred ninety thousand, five hundred thirty-nine".