1221000192 has 198 divisors, whose sum is σ = 3731075088. Its totient is φ = 384528384.

The previous prime is 1221000181. The next prime is 1221000203. The reversal of 1221000192 is 2910001221.

It is an interprime number because it is at equal distance from previous prime (1221000181) and next prime (1221000203).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 3326793 + ... + 3327159.

Almost surely, 2^1221000192 is an apocalyptic number.

1221000192 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1221000192, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1865537544).

1221000192 is an abundant number, since it is smaller than the sum of its proper divisors (2510074896).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1221000192 is a wasteful number, since it uses less digits than its factorization.

1221000192 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 431 (or 391 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

The square root of 1221000192 is about 34942.8131666585. The cubic root of 1221000192 is about 1068.8216544551.

The spelling of 1221000192 in words is "one billion, two hundred twenty-one million, one hundred ninety-two", and thus it is an aban number.