221142494 has 8 divisors (see below), whose sum is σ = 351226368. Its totient is φ = 104067040.

The previous prime is 221142491. The next prime is 221142503. The reversal of 221142494 is 494241122.

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221142491) 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, 3252062 + ... + 3252129.

It is an arithmetic number, because the mean of its divisors is an integer number (43903296).

Almost surely, 2^221142494 is an apocalyptic number.

221142494 is a deficient number, since it is larger than the sum of its proper divisors (130083874).

221142494 is a wasteful number, since it uses less digits than its factorization.

221142494 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6504210.

The product of its digits is 4608, while the sum is 29.

The square root of 221142494 is about 14870.8605668939. The cubic root of 221142494 is about 604.7242729639.

The spelling of 221142494 in words is "two hundred twenty-one million, one hundred forty-two thousand, four hundred ninety-four".