221064633 has 12 divisors (see below), whose sum is σ = 331142448. Its totient is φ = 147376260.

The previous prime is 221064629. The next prime is 221064647. The reversal of 221064633 is 336460122.

221064633 is a `hidden beast` number, since 2 + 2 + 10 + 646 + 3 + 3 = 666.

It is not a de Polignac number, because 221064633 - 2² = 221064629 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 221064597 and 221064606.

It is not an unprimeable number, because it can be changed into a prime (221064653) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 454623 + ... + 455108.

It is an arithmetic number, because the mean of its divisors is an integer number (27595204).

Almost surely, 2^221064633 is an apocalyptic number.

It is an amenable number.

221064633 is a deficient number, since it is larger than the sum of its proper divisors (110077815).

221064633 is an frugal number, since it uses more digits than its factorization.

221064633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 909746 (or 909734 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 27.

The square root of 221064633 is about 14868.2424314376. The cubic root of 221064633 is about 604.6532931434.

The spelling of 221064633 in words is "two hundred twenty-one million, sixty-four thousand, six hundred thirty-three".