494722021 has 4 divisors (see below), whose sum is σ = 503107200. Its totient is φ = 486336844.

The previous prime is 494722013. The next prime is 494722027. The reversal of 494722021 is 120227494.

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 494722021 - 2³ = 494722013 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 (494722027) 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, 4192501 + ... + 4192618.

It is an arithmetic number, because the mean of its divisors is an integer number (125776800).

Almost surely, 2^494722021 is an apocalyptic number.

It is an amenable number.

494722021 is a deficient number, since it is larger than the sum of its proper divisors (8385179).

494722021 is an equidigital number, since it uses as much as digits as its factorization.

494722021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8385178.

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 494722021 is about 22242.3474705347. The cubic root of 494722021 is about 790.8978847349.

The spelling of 494722021 in words is "four hundred ninety-four million, seven hundred twenty-two thousand, twenty-one".