1220210001 has 40 divisors (see below), whose sum is σ = 1930230720.
Its totient is φ = 766037088.
The previous prime is 1220209999. The next prime is 1220210009. The reversal of 1220210001 is 1000120221.
It is not a de Polignac number, because 1220210001 - 21 = 1220209999 is a prime.
It is a Harshad number since it is a multiple of its sum of digits (9).
It is not an unprimeable number, because it can be changed into a prime (1220210009) by changing a digit.
It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 263956 + ... + 268538.
It is an arithmetic number, because the mean of its divisors is an integer number (48255768).
Almost surely, 21220210001 is an apocalyptic number.
It is an amenable number.
1220210001 is a deficient number, since it is larger than the sum of its proper divisors (710020719).
1220210001 is a wasteful number, since it uses less digits than its factorization.
1220210001 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 4787 (or 4778 counting only the distinct ones).
The product of its (nonzero) digits is 8, while the sum is 9.
The square root of 1220210001 is about 34931.5044193633.
The cubic root of 1220210001 is about 1068.5910360063.
Adding to 1220210001 its reverse (1000120221), we get a palindrome (2220330222).
The spelling of 1220210001 in words is "one billion, two hundred twenty million, two hundred ten thousand, one".