1210001001 has 8 divisors (see below), whose sum is σ = 1760001504. Its totient is φ = 733333920.

The previous prime is 1210000999. The next prime is 1210001003. The reversal of 1210001001 is 1001000121.

It is an interprime number because it is at equal distance from previous prime (1210000999) and next prime (1210001003).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1210001001 - 2¹ = 1210000999 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1210001003) 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, 18333316 + ... + 18333381.

It is an arithmetic number, because the mean of its divisors is an integer number (220000188).

Almost surely, 2^1210001001 is an apocalyptic number.

1210001001 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1210001001 is a deficient number, since it is larger than the sum of its proper divisors (550000503).

1210001001 is a wasteful number, since it uses less digits than its factorization.

1210001001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36666711.

The product of its (nonzero) digits is 2, while the sum is 6.

The square root of 1210001001 is about 34785.0686502126. The cubic root of 1210001001 is about 1065.6025306144.

Adding to 1210001001 its reverse (1001000121), we get a palindrome (2211001122).

The spelling of 1210001001 in words is "one billion, two hundred ten million, one thousand, one".