1220129342 has 4 divisors (see below), whose sum is σ = 1830194016. Its totient is φ = 610064670.

The previous prime is 1220129333. The next prime is 1220129363. The reversal of 1220129342 is 2439210221.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×1220129342² = 2977431222418705928, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305032334 + ... + 305032337.

It is an arithmetic number, because the mean of its divisors is an integer number (457548504).

Almost surely, 2^1220129342 is an apocalyptic number.

1220129342 is a deficient number, since it is larger than the sum of its proper divisors (610064674).

1220129342 is an equidigital number, since it uses as much as digits as its factorization.

1220129342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 610064673.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 1220129342 is about 34930.3498694187. The cubic root of 1220129342 is about 1068.5674899545.

Adding to 1220129342 its reverse (2439210221), we get a palindrome (3659339563).

The spelling of 1220129342 in words is "one billion, two hundred twenty million, one hundred twenty-nine thousand, three hundred forty-two".