1220011000 has 96 divisors (see below), whose sum is σ = 3091748400. Its totient is φ = 450403200.

The previous prime is 1220010977. The next prime is 1220011003. The reversal of 1220011000 is 1100221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220011003) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 165391 + ... + 172609.

Almost surely, 2^1220011000 is an apocalyptic number.

1220011000 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 1220011000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1545874200).

1220011000 is an abundant number, since it is smaller than the sum of its proper divisors (1871737400).

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

1220011000 is a wasteful number, since it uses less digits than its factorization.

1220011000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7266 (or 7239 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 7.

The square root of 1220011000 is about 34928.6558573330. The cubic root of 1220011000 is about 1068.5329415674.

Adding to 1220011000 its reverse (1100221), we get a palindrome (1221111221).

The spelling of 1220011000 in words is "one billion, two hundred twenty million, eleven thousand".