16361221121 has 8 divisors (see below), whose sum is σ = 18880078464. Its totient is φ = 13887748800.

The previous prime is 16361221103. The next prime is 16361221133. The reversal of 16361221121 is 12112216361.

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 16361221121 - 2¹⁰ = 16361220097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16361221021) 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, 11345480 + ... + 11346921.

It is an arithmetic number, because the mean of its divisors is an integer number (2360009808).

Almost surely, 2^16361221121 is an apocalyptic number.

It is an amenable number.

16361221121 is a deficient number, since it is larger than the sum of its proper divisors (2518857343).

16361221121 is a wasteful number, since it uses less digits than its factorization.

16361221121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22692511.

The product of its digits is 864, while the sum is 26.

Adding to 16361221121 its reverse (12112216361), we get a palindrome (28473437482).

The spelling of 16361221121 in words is "sixteen billion, three hundred sixty-one million, two hundred twenty-one thousand, one hundred twenty-one".