1210771220 has 24 divisors (see below), whose sum is σ = 2590595784. Its totient is φ = 475170176.

The previous prime is 1210771217. The next prime is 1210771403. The reversal of 1210771220 is 221770121.

It can be written as a sum of positive squares in 4 ways, for example, as 439153936 + 771617284 = 20956^2 + 27778^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 570059 + ... + 572178.

It is an arithmetic number, because the mean of its divisors is an integer number (107941491).

Almost surely, 2^1210771220 is an apocalyptic number.

1210771220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1210771220 is an abundant number, since it is smaller than the sum of its proper divisors (1379824564).

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

1210771220 is a wasteful number, since it uses less digits than its factorization.

1210771220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1142299 (or 1142297 counting only the distinct ones).

The product of its (nonzero) digits is 392, while the sum is 23.

The square root of 1210771220 is about 34796.1380040946. The cubic root of 1210771220 is about 1065.8285836588.

The spelling of 1210771220 in words is "one billion, two hundred ten million, seven hundred seventy-one thousand, two hundred twenty".