221512423206 has 16 divisors (see below), whose sum is σ = 462286796544. Its totient is φ = 70627149384.

The previous prime is 221512423193. The next prime is 221512423211. The reversal of 221512423206 is 602324215122.

It is a congruent 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, 802581106 + ... + 802581381.

It is an arithmetic number, because the mean of its divisors is an integer number (28892924784).

Almost surely, 2^221512423206 is an apocalyptic number.

221512423206 is an abundant number, since it is smaller than the sum of its proper divisors (240774373338).

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

221512423206 is a wasteful number, since it uses less digits than its factorization.

221512423206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1605162515.

The product of its (nonzero) digits is 11520, while the sum is 30.

Adding to 221512423206 its reverse (602324215122), we get a palindrome (823836638328).

The spelling of 221512423206 in words is "two hundred twenty-one billion, five hundred twelve million, four hundred twenty-three thousand, two hundred six".