221013426 has 16 divisors (see below), whose sum is σ = 442999584. Its totient is φ = 73509024.

The previous prime is 221013409. The next prime is 221013451. The reversal of 221013426 is 624310122.

221013426 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×221013426³ (a number of 26 digits) contains 333 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37560 + ... + 43043.

It is an arithmetic number, because the mean of its divisors is an integer number (27687474).

Almost surely, 2^221013426 is an apocalyptic number.

221013426 is an abundant number, since it is smaller than the sum of its proper divisors (221986158).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221013426 is a wasteful number, since it uses less digits than its factorization.

221013426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81065.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 221013426 is about 14866.5203057070. The cubic root of 221013426 is about 604.6066026171.

Adding to 221013426 its reverse (624310122), we get a palindrome (845323548).

The spelling of 221013426 in words is "two hundred twenty-one million, thirteen thousand, four hundred twenty-six".