1221142 has 16 divisors (see below), whose sum is σ = 2004912. Its totient is φ = 554400.

The previous prime is 1221131. The next prime is 1221163. The reversal of 1221142 is 2411221.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1392 + ... + 2092.

It is an arithmetic number, because the mean of its divisors is an integer number (125307).

2^1221142 is an apocalyptic number.

1221142 is a deficient number, since it is larger than the sum of its proper divisors (783770).

1221142 is a wasteful number, since it uses less digits than its factorization.

1221142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 783.

The product of its digits is 32, while the sum is 13.

The square root of 1221142 is about 1105.0529399083. The cubic root of 1221142 is about 106.8863030805.

Adding to 1221142 its reverse (2411221), we get a palindrome (3632363).

The spelling of 1221142 in words is "one million, two hundred twenty-one thousand, one hundred forty-two".