1212001 has 12 divisors (see below), whose sum is σ = 1433536. Its totient is φ = 1003680.

The previous prime is 1211999. The next prime is 1212011. The reversal of 1212001 is 1002121.

1212001 = T₉₉ + T₁₀₀ + ... + T₂₀₁.

It is not a de Polignac number, because 1212001 - 2¹ = 1211999 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (7).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11716 + ... + 11818.

2^1212001 is an apocalyptic number.

It is an amenable number.

1212001 is a deficient number, since it is larger than the sum of its proper divisors (221535).

1212001 is an equidigital number, since it uses as much as digits as its factorization.

1212001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192 (or 151 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 7.

The square root of 1212001 is about 1100.9091697320. The cubic root of 1212001 is about 106.6189315489.

Adding to 1212001 its reverse (1002121), we get a palindrome (2214122).

The spelling of 1212001 in words is "one million, two hundred twelve thousand, one".