63622021 has 4 divisors (see below), whose sum is σ = 64252044. Its totient is φ = 62992000.

The previous prime is 63622003. The next prime is 63622087. The reversal of 63622021 is 12022636.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 55130625 + 8491396 = 7425^2 + 2914^2 .

It is a cyclic number.

It is not a de Polignac number, because 63622021 - 2¹¹ = 63619973 is a prime.

It is a super-2 number, since 2×63622021² = 8095523112248882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 63621983 and 63622001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63622121) 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, 314860 + ... + 315061.

It is an arithmetic number, because the mean of its divisors is an integer number (16063011).

Almost surely, 2^63622021 is an apocalyptic number.

It is an amenable number.

63622021 is a deficient number, since it is larger than the sum of its proper divisors (630023).

63622021 is a wasteful number, since it uses less digits than its factorization.

63622021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 630022.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 63622021 is about 7976.3413292060. The cubic root of 63622021 is about 399.2109884252.

Adding to 63622021 its reverse (12022636), we get a palindrome (75644657).

The spelling of 63622021 in words is "sixty-three million, six hundred twenty-two thousand, twenty-one".