1271000220 has 192 divisors, whose sum is σ = 4187904000. Its totient is φ = 287884800.

The previous prime is 1271000191. The next prime is 1271000233. The reversal of 1271000220 is 220001721.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 1271000220.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3107376 + ... + 3107784.

It is an arithmetic number, because the mean of its divisors is an integer number (21812000).

Almost surely, 2^1271000220 is an apocalyptic number.

1271000220 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 1271000220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2093952000).

1271000220 is an abundant number, since it is smaller than the sum of its proper divisors (2916903780).

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

1271000220 is a wasteful number, since it uses less digits than its factorization.

1271000220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 593 (or 577 counting only the distinct ones).

The product of its (nonzero) digits is 56, while the sum is 15.

The square root of 1271000220 is about 35651.0900254116. The cubic root of 1271000220 is about 1083.2163549168.

Adding to 1271000220 its reverse (220001721), we get a palindrome (1491001941).

The spelling of 1271000220 in words is "one billion, two hundred seventy-one million, two hundred twenty", and thus it is an aban number.