622235021 has 4 divisors (see below), whose sum is σ = 635474112. Its totient is φ = 608995932.

The previous prime is 622234997. The next prime is 622235023. The reversal of 622235021 is 120532226.

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: 120532226 = 2 ⋅60266113.

It is a cyclic number.

It is not a de Polignac number, because 622235021 - 2¹⁴ = 622218637 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 (622235023) 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, 6619475 + ... + 6619568.

It is an arithmetic number, because the mean of its divisors is an integer number (158868528).

Almost surely, 2^622235021 is an apocalyptic number.

It is an amenable number.

622235021 is a deficient number, since it is larger than the sum of its proper divisors (13239091).

622235021 is a wasteful number, since it uses less digits than its factorization.

622235021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13239090.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 622235021 is about 24944.6391234670. The cubic root of 622235021 is about 853.7252968021.

Adding to 622235021 its reverse (120532226), we get a palindrome (742767247).

The spelling of 622235021 in words is "six hundred twenty-two million, two hundred thirty-five thousand, twenty-one".