212221564654 has 16 divisors (see below), whose sum is σ = 350851774896. Its totient is φ = 95469868800.

The previous prime is 212221564649. The next prime is 212221564661. The reversal of 212221564654 is 456465122212.

212221564654 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 a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49721757 + ... + 49726024.

It is an arithmetic number, because the mean of its divisors is an integer number (21928235931).

Almost surely, 2^212221564654 is an apocalyptic number.

212221564654 is a deficient number, since it is larger than the sum of its proper divisors (138630210242).

212221564654 is a wasteful number, since it uses less digits than its factorization.

212221564654 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99447891.

The product of its digits is 230400, while the sum is 40.

Adding to 212221564654 its reverse (456465122212), we get a palindrome (668686686866).

The spelling of 212221564654 in words is "two hundred twelve billion, two hundred twenty-one million, five hundred sixty-four thousand, six hundred fifty-four".