1205421053 has 16 divisors (see below), whose sum is σ = 1279618560. Its totient is φ = 1133123376.

The previous prime is 1205421001. The next prime is 1205421067. The reversal of 1205421053 is 3501245021.

It is a cyclic number.

It is not a de Polignac number, because 1205421053 - 2¹² = 1205416957 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1205421353) 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, 1014926 + ... + 1016112.

It is an arithmetic number, because the mean of its divisors is an integer number (79976160).

Almost surely, 2^1205421053 is an apocalyptic number.

It is an amenable number.

1205421053 is a deficient number, since it is larger than the sum of its proper divisors (74197507).

1205421053 is a wasteful number, since it uses less digits than its factorization.

1205421053 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1936.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 1205421053 is about 34719.1741405236. The cubic root of 1205421053 is about 1064.2563678906.

Adding to 1205421053 its reverse (3501245021), we get a palindrome (4706666074).

The spelling of 1205421053 in words is "one billion, two hundred five million, four hundred twenty-one thousand, fifty-three".