722021021 has 8 divisors (see below), whose sum is σ = 725524800. Its totient is φ = 718525440.

The previous prime is 722021009. The next prime is 722021087. The reversal of 722021021 is 120120227.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 722021021 - 2²⁶ = 654912157 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (722021821) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 237650 + ... + 240668.

It is an arithmetic number, because the mean of its divisors is an integer number (90690600).

Almost surely, 2^722021021 is an apocalyptic number.

It is an amenable number.

722021021 is a deficient number, since it is larger than the sum of its proper divisors (3503779).

722021021 is a wasteful number, since it uses less digits than its factorization.

722021021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4099.

The product of its (nonzero) digits is 112, while the sum is 17.

The square root of 722021021 is about 26870.4488425482. The cubic root of 722021021 is about 897.1187782028.

Adding to 722021021 its reverse (120120227), we get a palindrome (842141248).

The spelling of 722021021 in words is "seven hundred twenty-two million, twenty-one thousand, twenty-one".