221248101 has 4 divisors (see below), whose sum is σ = 294997472. Its totient is φ = 147498732.

The previous prime is 221248087. The next prime is 221248133. The reversal of 221248101 is 101842122.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 221248101 - 2⁷ = 221247973 is a prime.

It is a super-2 number, since 2×221248101² = 97901444392212402, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221248301) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36874681 + ... + 36874686.

It is an arithmetic number, because the mean of its divisors is an integer number (73749368).

Almost surely, 2^221248101 is an apocalyptic number.

It is an amenable number.

221248101 is a deficient number, since it is larger than the sum of its proper divisors (73749371).

221248101 is an equidigital number, since it uses as much as digits as its factorization.

221248101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73749370.

The product of its (nonzero) digits is 256, while the sum is 21.

The square root of 221248101 is about 14874.4109463199. The cubic root of 221248101 is about 604.8205200365.

The spelling of 221248101 in words is "two hundred twenty-one million, two hundred forty-eight thousand, one hundred one".