1220210120 has 32 divisors (see below), whose sum is σ = 2759427000.
Its totient is φ = 485603328.
The previous prime is 1220210107. The next prime is 1220210129. The reversal of 1220210120 is 210120221.
It is a happy number.
It can be written as a sum of positive squares in 4 ways, for example, as 1172240644 + 47969476 = 34238^2 + 6926^2
It is not an unprimeable number, because it can be changed into a prime (1220210129) by changing a digit.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69545 + ... + 85304.
Almost surely, 21220210120 is an apocalyptic number.
1220210120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.
It is an amenable number.
1220210120 is an abundant number, since it is smaller than the sum of its proper divisors (1539216880).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
1220210120 is a wasteful number, since it uses less digits than its factorization.
1220210120 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 155057 (or 155053 counting only the distinct ones).
The product of its (nonzero) digits is 16, while the sum is 11.
The square root of 1220210120 is about 34931.5061226967.
The cubic root of 1220210120 is about 1068.5910707441.
Adding to 1220210120 its reverse (210120221), we get a palindrome (1430330341).
It can be divided in two parts, 12202 and 10120, that added together give a palindrome (22322).
The spelling of 1220210120 in words is "one billion, two hundred twenty million, two hundred ten thousand, one hundred twenty".