221274973 has 8 divisors (see below), whose sum is σ = 231064128. Its totient is φ = 211499904.

The previous prime is 221274961. The next prime is 221275001. The reversal of 221274973 is 379472122.

221274973 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-221274973 is a prime.

It is a super-2 number, since 2×221274973² = 97925227352301458, 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 (221274913) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40365 + ... + 45517.

It is an arithmetic number, because the mean of its divisors is an integer number (28883016).

Almost surely, 2^221274973 is an apocalyptic number.

221274973 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

221274973 is a deficient number, since it is larger than the sum of its proper divisors (9789155).

221274973 is a wasteful number, since it uses less digits than its factorization.

221274973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7043.

The product of its digits is 42336, while the sum is 37.

The square root of 221274973 is about 14875.3142151687. The cubic root of 221274973 is about 604.8450054882.

The spelling of 221274973 in words is "two hundred twenty-one million, two hundred seventy-four thousand, nine hundred seventy-three".