535721621 has 4 divisors (see below), whose sum is σ = 548788044. Its totient is φ = 522655200.

The previous prime is 535721573. The next prime is 535721639. The reversal of 535721621 is 126127535.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 53436100 + 482285521 = 7310^2 + 21961^2 .

It is a cyclic number.

It is not a de Polignac number, because 535721621 - 2²² = 531527317 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 (535721671) 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, 6533150 + ... + 6533231.

It is an arithmetic number, because the mean of its divisors is an integer number (137197011).

Almost surely, 2^535721621 is an apocalyptic number.

It is an amenable number.

535721621 is a deficient number, since it is larger than the sum of its proper divisors (13066423).

535721621 is a wasteful number, since it uses less digits than its factorization.

535721621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13066422.

The product of its digits is 12600, while the sum is 32.

The square root of 535721621 is about 23145.6609540536. The cubic root of 535721621 is about 812.1689676644.

The spelling of 535721621 in words is "five hundred thirty-five million, seven hundred twenty-one thousand, six hundred twenty-one".