1212110001 has 24 divisors (see below), whose sum is σ = 1817655840. Its totient is φ = 807190272.

The previous prime is 1212109999. The next prime is 1212110041. The reversal of 1212110001 is 1000112121.

It is a happy number.

It is not a de Polignac number, because 1212110001 - 2¹ = 1212109999 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 (1212110041) 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, 280465 + ... + 284753.

It is an arithmetic number, because the mean of its divisors is an integer number (75735660).

Almost surely, 2^1212110001 is an apocalyptic number.

It is an amenable number.

1212110001 is a deficient number, since it is larger than the sum of its proper divisors (605545839).

1212110001 is an equidigital number, since it uses as much as digits as its factorization.

1212110001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5467 (or 5455 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

The square root of 1212110001 is about 34815.3701832969. The cubic root of 1212110001 is about 1066.2212770188.

Adding to 1212110001 its reverse (1000112121), we get a palindrome (2212222122).

It can be divided in two parts, 12121 and 10001, that multiplied together give a palindrome (121222121).

The spelling of 1212110001 in words is "one billion, two hundred twelve million, one hundred ten thousand, one".