221206026 has 16 divisors (see below), whose sum is σ = 457668000. Its totient is φ = 71192688.

The previous prime is 221206021. The next prime is 221206031. The reversal of 221206026 is 620602122.

221206026 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (221206021) and next prime (221206031).

It is a junction number, because it is equal to n+sod(n) for n = 221205993 and 221206011.

It is not an unprimeable number, because it can be changed into a prime (221206021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 635476 + ... + 635823.

It is an arithmetic number, because the mean of its divisors is an integer number (28604250).

Almost surely, 2^221206026 is an apocalyptic number.

221206026 is an abundant number, since it is smaller than the sum of its proper divisors (236461974).

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

221206026 is a wasteful number, since it uses less digits than its factorization.

221206026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1271333.

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

The square root of 221206026 is about 14872.9965373492. The cubic root of 221206026 is about 604.7821778065.

Adding to 221206026 its reverse (620602122), we get a palindrome (841808148).

The spelling of 221206026 in words is "two hundred twenty-one million, two hundred six thousand, twenty-six".