1200421501 has 16 divisors (see below), whose sum is σ = 1311701760. Its totient is φ = 1094748480.

The previous prime is 1200421483. The next prime is 1200421507. The reversal of 1200421501 is 1051240021.

It is a cyclic number.

It is not a de Polignac number, because 1200421501 - 2²¹ = 1198324349 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200421507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43455 + ... + 65491.

It is an arithmetic number, because the mean of its divisors is an integer number (81981360).

Almost surely, 2^1200421501 is an apocalyptic number.

It is an amenable number.

1200421501 is a deficient number, since it is larger than the sum of its proper divisors (111280259).

1200421501 is a wasteful number, since it uses less digits than its factorization.

1200421501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22164.

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 1200421501 is about 34647.0994601280. The cubic root of 1200421501 is about 1062.7829745206.

Adding to 1200421501 its reverse (1051240021), we get a palindrome (2251661522).

The spelling of 1200421501 in words is "one billion, two hundred million, four hundred twenty-one thousand, five hundred one".