495436021 has 4 divisors (see below), whose sum is σ = 498204000. Its totient is φ = 492668044.

The previous prime is 495436013. The next prime is 495436037. The reversal of 495436021 is 120634594.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 120634594 = 2 ⋅60317297.

It is a cyclic number.

It is not a de Polignac number, because 495436021 - 2³ = 495436013 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 (495436091) 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, 1383721 + ... + 1384078.

It is an arithmetic number, because the mean of its divisors is an integer number (124551000).

Almost surely, 2^495436021 is an apocalyptic number.

It is an amenable number.

495436021 is a deficient number, since it is larger than the sum of its proper divisors (2767979).

495436021 is a wasteful number, since it uses less digits than its factorization.

495436021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2767978.

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 495436021 is about 22258.3921476822. The cubic root of 495436021 is about 791.2781856029.

The spelling of 495436021 in words is "four hundred ninety-five million, four hundred thirty-six thousand, twenty-one".