221151694946 has 16 divisors (see below), whose sum is σ = 408280052544. Its totient is φ = 87488582544.

The previous prime is 221151694919. The next prime is 221151694991. The reversal of 221151694946 is 649496151122.

It is a happy number.

221151694946 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 221151694894 and 221151694903.

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, 607559420 + ... + 607559783.

It is an arithmetic number, because the mean of its divisors is an integer number (25517503284).

Almost surely, 2^221151694946 is an apocalyptic number.

221151694946 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

221151694946 is a deficient number, since it is larger than the sum of its proper divisors (187128357598).

221151694946 is a wasteful number, since it uses less digits than its factorization.

221151694946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1215119225.

The product of its digits is 933120, while the sum is 50.

The spelling of 221151694946 in words is "two hundred twenty-one billion, one hundred fifty-one million, six hundred ninety-four thousand, nine hundred forty-six".