1602135221 has 4 divisors (see below), whose sum is σ = 1603351200. Its totient is φ = 1600919244.

The previous prime is 1602135193. The next prime is 1602135281. The reversal of 1602135221 is 1225312061.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1602135221 - 2¹⁰ = 1602134197 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 (1602135281) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 606011 + ... + 608648.

It is an arithmetic number, because the mean of its divisors is an integer number (400837800).

Almost surely, 2^1602135221 is an apocalyptic number.

It is an amenable number.

1602135221 is a deficient number, since it is larger than the sum of its proper divisors (1215979).

1602135221 is a wasteful number, since it uses less digits than its factorization.

1602135221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1215978.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 1602135221 is about 40026.6813638103. The cubic root of 1602135221 is about 1170.1271493540.

Adding to 1602135221 its reverse (1225312061), we get a palindrome (2827447282).

The spelling of 1602135221 in words is "one billion, six hundred two million, one hundred thirty-five thousand, two hundred twenty-one".