1205352421 has 60 divisors (see below), whose sum is σ = 1604715308. Its totient is φ = 899724672.

The previous prime is 1205352397. The next prime is 1205352427. The reversal of 1205352421 is 1242535021.

It can be written as a sum of positive squares in 2 ways, for example, as 411521796 + 793830625 = 20286^2 + 28175^2 .

It is not a de Polignac number, because 1205352421 - 2⁵ = 1205352389 is a prime.

It is a super-2 number, since 2×1205352421² = 2905748917621122482, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1205352427) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 16511641 + ... + 16511713.

Almost surely, 2^1205352421 is an apocalyptic number.

It is an amenable number.

1205352421 is a deficient number, since it is larger than the sum of its proper divisors (399362887).

1205352421 is an frugal number, since it uses more digits than its factorization.

1205352421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160 (or 116 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 1205352421 is about 34718.1857388891. The cubic root of 1205352421 is about 1064.2361692972.

Adding to 1205352421 its reverse (1242535021), we get a palindrome (2447887442).

The spelling of 1205352421 in words is "one billion, two hundred five million, three hundred fifty-two thousand, four hundred twenty-one".