1201221000 has 384 divisors, whose sum is σ = 4847731200. Its totient is φ = 262310400.

The previous prime is 1201220987. The next prime is 1201221011. The reversal of 1201221000 is 1221021.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1448586 + ... + 1449414.

It is an arithmetic number, because the mean of its divisors is an integer number (12624300).

Almost surely, 2^1201221000 is an apocalyptic number.

1201221000 is a gapful number since it is divisible by the number (10) 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 1201221000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2423865600).

1201221000 is an abundant number, since it is smaller than the sum of its proper divisors (3646510200).

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

1201221000 is a wasteful number, since it uses less digits than its factorization.

1201221000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 886 (or 869 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 1201221000 is about 34658.6352876163. The cubic root of 1201221000 is about 1063.0188653745.

Adding to 1201221000 its reverse (1221021), we get a palindrome (1202442021).

The spelling of 1201221000 in words is "one billion, two hundred one million, two hundred twenty-one thousand".