1221019342 has 4 divisors (see below), whose sum is σ = 1831529016. Its totient is φ = 610509670.

The previous prime is 1221019321. The next prime is 1221019343. The reversal of 1221019342 is 2439101221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2439101221 = 79 ⋅30874699.

It is a super-2 number, since 2×1221019342² = 2981776467076225928, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221019343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305254834 + ... + 305254837.

It is an arithmetic number, because the mean of its divisors is an integer number (457882254).

Almost surely, 2^1221019342 is an apocalyptic number.

1221019342 is a deficient number, since it is larger than the sum of its proper divisors (610509674).

1221019342 is an equidigital number, since it uses as much as digits as its factorization.

1221019342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 610509673.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 1221019342 is about 34943.0871847351. The cubic root of 1221019342 is about 1068.8272421767.

The spelling of 1221019342 in words is "one billion, two hundred twenty-one million, nineteen thousand, three hundred forty-two".