1210220001 has 16 divisors (see below), whose sum is σ = 1836649920. Its totient is φ = 787134240.

The previous prime is 1210219973. The next prime is 1210220017. The reversal of 1210220001 is 1000220121.

It is not a de Polignac number, because 1210220001 - 2⁶ = 1210219937 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 (1210227001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 545515 + ... + 547728.

It is an arithmetic number, because the mean of its divisors is an integer number (114790620).

Almost surely, 2^1210220001 is an apocalyptic number.

It is an amenable number.

1210220001 is a deficient number, since it is larger than the sum of its proper divisors (626429919).

1210220001 is a wasteful number, since it uses less digits than its factorization.

1210220001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1093293 (or 1093287 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 1210220001 is about 34788.2164101582. The cubic root of 1210220001 is about 1065.6668151002. Note that the first 3 decimals are identical.

Adding to 1210220001 its reverse (1000220121), we get a palindrome (2210440122).

It can be divided in two parts, 121022000 and 1, that added together give a square (121022001 = 11001²).

The spelling of 1210220001 in words is "one billion, two hundred ten million, two hundred twenty thousand, one".