1221002198 has 8 divisors (see below), whose sum is σ = 1972388208. Its totient is φ = 563539464.

The previous prime is 1221002197. The next prime is 1221002201. The reversal of 1221002198 is 8912001221.

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

It is a Harshad number since it is a multiple of its sum of digits (26), and also a Moran number because the ratio is a prime number: 46961623 = 1221002198 / (1 + 2 + 2 + 1 + 0 + 0 + 2 + 1 + 9 + 8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221002191) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23480786 + ... + 23480837.

It is an arithmetic number, because the mean of its divisors is an integer number (246548526).

Almost surely, 2^1221002198 is an apocalyptic number.

1221002198 is a deficient number, since it is larger than the sum of its proper divisors (751386010).

1221002198 is a wasteful number, since it uses less digits than its factorization.

1221002198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46961638.

The product of its (nonzero) digits is 576, while the sum is 26.

The square root of 1221002198 is about 34942.8418706893. The cubic root of 1221002198 is about 1068.8222397826.

The spelling of 1221002198 in words is "one billion, two hundred twenty-one million, two thousand, one hundred ninety-eight".