16123162421 has 2 divisors, whose sum is σ = 16123162422. Its totient is φ = 16123162420.

The previous prime is 16123162417. The next prime is 16123162463. The reversal of 16123162421 is 12426132161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16075704100 + 47458321 = 126790^2 + 6889^2 .

It is a cyclic number.

It is not a de Polignac number, because 16123162421 - 2² = 16123162417 is a prime.

It is a super-3 number, since 3×16123162421³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16123162621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8061581210 + 8061581211.

It is an arithmetic number, because the mean of its divisors is an integer number (8061581211).

Almost surely, 2^16123162421 is an apocalyptic number.

It is an amenable number.

16123162421 is a deficient number, since it is larger than the sum of its proper divisors (1).

16123162421 is an equidigital number, since it uses as much as digits as its factorization.

16123162421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3456, while the sum is 29.

Adding to 16123162421 its reverse (12426132161), we get a palindrome (28549294582).

The spelling of 16123162421 in words is "sixteen billion, one hundred twenty-three million, one hundred sixty-two thousand, four hundred twenty-one".