221251297628 has 12 divisors (see below), whose sum is σ = 404024108880. Its totient is φ = 105815837952.

The previous prime is 221251297613. The next prime is 221251297649. The reversal of 221251297628 is 826792152122.

221251297628 is digitally balanced in base 2, because in such base 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 3 ways as a sum of consecutive naturals, for example, 1202452613 + ... + 1202452796.

It is an arithmetic number, because the mean of its divisors is an integer number (33668675740).

Almost surely, 2^221251297628 is an apocalyptic number.

It is an amenable number.

221251297628 is a deficient number, since it is larger than the sum of its proper divisors (182772811252).

221251297628 is a wasteful number, since it uses less digits than its factorization.

221251297628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2404905436 (or 2404905434 counting only the distinct ones).

The product of its digits is 483840, while the sum is 47.

The spelling of 221251297628 in words is "two hundred twenty-one billion, two hundred fifty-one million, two hundred ninety-seven thousand, six hundred twenty-eight".