1221193898 has 8 divisors (see below), whose sum is σ = 1832416320. Its totient is φ = 610388460.

The previous prime is 1221193877. The next prime is 1221193907. The reversal of 1221193898 is 8983911221.

It is a happy number.

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

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, 96818 + ... + 108701.

It is an arithmetic number, because the mean of its divisors is an integer number (229052040).

Almost surely, 2^1221193898 is an apocalyptic number.

1221193898 is a deficient number, since it is larger than the sum of its proper divisors (611222422).

1221193898 is a wasteful number, since it uses less digits than its factorization.

1221193898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208492.

The product of its digits is 62208, while the sum is 44.

The square root of 1221193898 is about 34945.5848141078. The cubic root of 1221193898 is about 1068.8781726607.

The spelling of 1221193898 in words is "one billion, two hundred twenty-one million, one hundred ninety-three thousand, eight hundred ninety-eight".