221238476706 has 32 divisors (see below), whose sum is σ = 479146344768. Its totient is φ = 67697277120.

The previous prime is 221238476689. The next prime is 221238476729. The reversal of 221238476706 is 607674832122.

It is a super-2 number, since 2×221238476706² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7821216 + ... + 7849451.

It is an arithmetic number, because the mean of its divisors is an integer number (14973323274).

Almost surely, 2^221238476706 is an apocalyptic number.

221238476706 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

221238476706 is an abundant number, since it is smaller than the sum of its proper divisors (257907868062).

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

221238476706 is a wasteful number, since it uses less digits than its factorization.

221238476706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15670866.

The product of its (nonzero) digits is 1354752, while the sum is 48.

The spelling of 221238476706 in words is "two hundred twenty-one billion, two hundred thirty-eight million, four hundred seventy-six thousand, seven hundred six".