221487701 has 4 divisors (see below), whose sum is σ = 221601600. Its totient is φ = 221373804.

The previous prime is 221487697. The next prime is 221487719. The reversal of 221487701 is 107784122.

It is a happy number.

221487701 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, and also an emirpimes, since its reverse is a distinct semiprime: 107784122 = 2 ⋅53892061.

It is a cyclic number.

It is not a de Polignac number, because 221487701 - 2² = 221487697 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221487001) 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, 53981 + ... + 57938.

It is an arithmetic number, because the mean of its divisors is an integer number (55400400).

Almost surely, 2^221487701 is an apocalyptic number.

It is an amenable number.

221487701 is a deficient number, since it is larger than the sum of its proper divisors (113899).

221487701 is a wasteful number, since it uses less digits than its factorization.

221487701 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113898.

The product of its (nonzero) digits is 6272, while the sum is 32.

The square root of 221487701 is about 14882.4628674155. The cubic root of 221487701 is about 605.0387708232.

The spelling of 221487701 in words is "two hundred twenty-one million, four hundred eighty-seven thousand, seven hundred one".