1200136421 has 8 divisors (see below), whose sum is σ = 1310536800. Its totient is φ = 1089952240.

The previous prime is 1200136409. The next prime is 1200136423. The reversal of 1200136421 is 1246310021.

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

It is a cyclic number.

It is not a de Polignac number, because 1200136421 - 2¹⁰ = 1200135397 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1200136393 and 1200136402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200136423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42326 + ... + 64743.

It is an arithmetic number, because the mean of its divisors is an integer number (163817100).

Almost surely, 2^1200136421 is an apocalyptic number.

1200136421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1200136421 is a deficient number, since it is larger than the sum of its proper divisors (110400379).

1200136421 is a wasteful number, since it uses less digits than its factorization.

1200136421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108099.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 1200136421 is about 34642.9851629446. The cubic root of 1200136421 is about 1062.6988368080.

Adding to 1200136421 its reverse (1246310021), we get a palindrome (2446446442).

The spelling of 1200136421 in words is "one billion, two hundred million, one hundred thirty-six thousand, four hundred twenty-one".