1221842534 has 8 divisors (see below), whose sum is σ = 1999378728. Its totient is φ = 555382960.

The previous prime is 1221842521. The next prime is 1221842563. The reversal of 1221842534 is 4352481221.

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

It is a self number, because there is not a number n which added to its sum of digits gives 1221842534.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27769127 + ... + 27769170.

It is an arithmetic number, because the mean of its divisors is an integer number (249922341).

Almost surely, 2^1221842534 is an apocalyptic number.

1221842534 is a deficient number, since it is larger than the sum of its proper divisors (777536194).

1221842534 is a wasteful number, since it uses less digits than its factorization.

1221842534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55538310.

The product of its digits is 15360, while the sum is 32.

The square root of 1221842534 is about 34954.8642394732. The cubic root of 1221842534 is about 1069.0673837131.

The spelling of 1221842534 in words is "one billion, two hundred twenty-one million, eight hundred forty-two thousand, five hundred thirty-four".