63621121 has 4 divisors (see below), whose sum is σ = 63868932. Its totient is φ = 63373312.

The previous prime is 63621119. The next prime is 63621133. The reversal of 63621121 is 12112636.

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 59459521 + 4161600 = 7711^2 + 2040^2 .

It is a cyclic number.

It is not a de Polignac number, because 63621121 - 2¹ = 63621119 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 63621092 and 63621101.

It is not an unprimeable number, because it can be changed into a prime (63621161) 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, 123520 + ... + 124033.

It is an arithmetic number, because the mean of its divisors is an integer number (15967233).

Almost surely, 2^63621121 is an apocalyptic number.

It is an amenable number.

63621121 is a deficient number, since it is larger than the sum of its proper divisors (247811).

63621121 is a wasteful number, since it uses less digits than its factorization.

63621121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247810.

The product of its digits is 432, while the sum is 22.

The square root of 63621121 is about 7976.2849121631. The cubic root of 63621121 is about 399.2091059973.

Adding to 63621121 its reverse (12112636), we get a palindrome (75733757).

The spelling of 63621121 in words is "sixty-three million, six hundred twenty-one thousand, one hundred twenty-one".