536921721 has 12 divisors (see below), whose sum is σ = 886347072. Its totient is φ = 306812376.

The previous prime is 536921713. The next prime is 536921743. The reversal of 536921721 is 127129635.

536921721 is a `hidden beast` number, since 536 + 92 + 17 + 21 = 666.

It is not a de Polignac number, because 536921721 - 2³ = 536921713 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (536921711) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4261221 + ... + 4261346.

It is an arithmetic number, because the mean of its divisors is an integer number (73862256).

Almost surely, 2^536921721 is an apocalyptic number.

It is an amenable number.

536921721 is a deficient number, since it is larger than the sum of its proper divisors (349425351).

536921721 is a wasteful number, since it uses less digits than its factorization.

536921721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8522580 (or 8522577 counting only the distinct ones).

The product of its digits is 22680, while the sum is 36.

The square root of 536921721 is about 23171.5713968647. The cubic root of 536921721 is about 812.7749770977.

The spelling of 536921721 in words is "five hundred thirty-six million, nine hundred twenty-one thousand, seven hundred twenty-one".