221266045 has 48 divisors (see below), whose sum is σ = 359291520. Its totient is φ = 127290240.

The previous prime is 221266037. The next prime is 221266057. The reversal of 221266045 is 540662122.

It is not a de Polignac number, because 221266045 - 2³ = 221266037 is a prime.

It is a super-4 number, since 4×221266045⁴ (a number of 34 digits) contains 4444 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 53046 + ... + 57064.

It is an arithmetic number, because the mean of its divisors is an integer number (7485240).

Almost surely, 2^221266045 is an apocalyptic number.

It is an amenable number.

221266045 is a deficient number, since it is larger than the sum of its proper divisors (138025475).

221266045 is a wasteful number, since it uses less digits than its factorization.

221266045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4066 (or 4055 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 221266045 is about 14875.0141176404. The cubic root of 221266045 is about 604.8368706191.

The spelling of 221266045 in words is "two hundred twenty-one million, two hundred sixty-six thousand, forty-five".