1012220001 has 24 divisors (see below), whose sum is σ = 1667189160. Its totient is φ = 586262016.

The previous prime is 1012219993. The next prime is 1012220009. The reversal of 1012220001 is 1000222101.

It is an interprime number because it is at equal distance from previous prime (1012219993) and next prime (1012220009).

It can be written as a sum of positive squares in 4 ways, for example, as 32216976 + 980003025 = 5676^2 + 31305^2 .

It is not a de Polignac number, because 1012220001 - 2³ = 1012219993 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 (1012220009) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 252466 + ... + 256443.

It is an arithmetic number, because the mean of its divisors is an integer number (69466215).

Almost surely, 2^1012220001 is an apocalyptic number.

It is an amenable number.

1012220001 is a deficient number, since it is larger than the sum of its proper divisors (654969159).

1012220001 is a wasteful number, since it uses less digits than its factorization.

1012220001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 508945 (or 508942 counting only the distinct ones).

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

The square root of 1012220001 is about 31815.4050893588. The cubic root of 1012220001 is about 1004.0568533516.

Adding to 1012220001 its reverse (1000222101), we get a palindrome (2012442102).

The spelling of 1012220001 in words is "one billion, twelve million, two hundred twenty thousand, one".