221272997 has 4 divisors (see below), whose sum is σ = 241388736. Its totient is φ = 201157260.

The previous prime is 221272979. The next prime is 221272999. The reversal of 221272997 is 799272122.

221272997 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.

It is a cyclic number.

It is not a de Polignac number, because 221272997 - 2¹⁴ = 221256613 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 (221272999) 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, 10057853 + ... + 10057874.

It is an arithmetic number, because the mean of its divisors is an integer number (60347184).

Almost surely, 2^221272997 is an apocalyptic number.

It is an amenable number.

221272997 is a deficient number, since it is larger than the sum of its proper divisors (20115739).

221272997 is a wasteful number, since it uses less digits than its factorization.

221272997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20115738.

The product of its digits is 63504, while the sum is 41.

The square root of 221272997 is about 14875.2477962554. The cubic root of 221272997 is about 604.8432050477.

The spelling of 221272997 in words is "two hundred twenty-one million, two hundred seventy-two thousand, nine hundred ninety-seven".