20164633121 has 4 divisors (see below), whose sum is σ = 20407580592. Its totient is φ = 19921685652.

The previous prime is 20164633087. The next prime is 20164633199. The reversal of 20164633121 is 12133646102.

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 20164633121 - 2⁶ = 20164633057 is a prime.

It is a super-2 number, since 2×20164633121² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20164633721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 121473611 + ... + 121473776.

It is an arithmetic number, because the mean of its divisors is an integer number (5101895148).

Almost surely, 2^20164633121 is an apocalyptic number.

It is an amenable number.

20164633121 is a deficient number, since it is larger than the sum of its proper divisors (242947471).

20164633121 is an equidigital number, since it uses as much as digits as its factorization.

20164633121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242947470.

The product of its (nonzero) digits is 5184, while the sum is 29.

The spelling of 20164633121 in words is "twenty billion, one hundred sixty-four million, six hundred thirty-three thousand, one hundred twenty-one".