221652497 has 4 divisors (see below), whose sum is σ = 241802736. Its totient is φ = 201502260.

The previous prime is 221652451. The next prime is 221652521. The reversal of 221652497 is 794256122.

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 a cyclic number.

It is not a de Polignac number, because 221652497 - 2⁸ = 221652241 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221652497.

It is not an unprimeable number, because it can be changed into a prime (221652407) 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, 10075103 + ... + 10075124.

It is an arithmetic number, because the mean of its divisors is an integer number (60450684).

Almost surely, 2^221652497 is an apocalyptic number.

It is an amenable number.

221652497 is a deficient number, since it is larger than the sum of its proper divisors (20150239).

221652497 is a wasteful number, since it uses less digits than its factorization.

221652497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20150238.

The product of its digits is 60480, while the sum is 38.

The square root of 221652497 is about 14887.9984215475. The cubic root of 221652497 is about 605.1887915694.

The spelling of 221652497 in words is "two hundred twenty-one million, six hundred fifty-two thousand, four hundred ninety-seven".