221287974 has 12 divisors (see below), whose sum is σ = 442648836. Its totient is φ = 73750512.

The previous prime is 221287973. The next prime is 221288021. The reversal of 221287974 is 479782122.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221287973) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 33402 + ... + 39474.

It is an arithmetic number, because the mean of its divisors is an integer number (36887403).

Almost surely, 2^221287974 is an apocalyptic number.

221287974 is an abundant number, since it is smaller than the sum of its proper divisors (221360862).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221287974 is an frugal number, since it uses more digits than its factorization.

221287974 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12151 (or 6078 counting only the distinct ones).

The product of its digits is 112896, while the sum is 42.

The square root of 221287974 is about 14875.7512079222. The cubic root of 221287974 is about 604.8568511356.

The spelling of 221287974 in words is "two hundred twenty-one million, two hundred eighty-seven thousand, nine hundred seventy-four".