142447221 has 16 divisors (see below), whose sum is σ = 241180800. Its totient is φ = 81398304.

The previous prime is 142447219. The next prime is 142447223. The reversal of 142447221 is 122744241.

It is an interprime number because it is at equal distance from previous prime (142447219) and next prime (142447223).

It is not a de Polignac number, because 142447221 - 2¹ = 142447219 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142447223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 376656 + ... + 377033.

It is an arithmetic number, because the mean of its divisors is an integer number (15073800).

Almost surely, 2^142447221 is an apocalyptic number.

It is an amenable number.

142447221 is a deficient number, since it is larger than the sum of its proper divisors (98733579).

142447221 is an equidigital number, since it uses as much as digits as its factorization.

142447221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 753705 (or 753699 counting only the distinct ones).

The product of its digits is 3584, while the sum is 27.

The square root of 142447221 is about 11935.1255125365. The cubic root of 142447221 is about 522.2574697618.

The spelling of 142447221 in words is "one hundred forty-two million, four hundred forty-seven thousand, two hundred twenty-one".