16126206121 has 3 divisors (see below), whose sum is σ = 16126333111. Its totient is φ = 16126079132.

The previous prime is 16126206119. The next prime is 16126206139. The reversal of 16126206121 is 12160262161.

The square root of 16126206121 is 126989.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 12160262161 = 1181 ⋅10296581.

It can be written as a sum of positive squares in only one way, i.e., 13926596121 + 2199610000 = 118011^2 + 46900^2 .

It is not a de Polignac number, because 16126206121 - 2¹ = 16126206119 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16126206121.

It is not an unprimeable number, because it can be changed into a prime (16126206521) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 63495 + ... + 190483.

Almost surely, 2^16126206121 is an apocalyptic number.

16126206121 is the 126989-th square number.

16126206121 is the 63495-th centered octagonal number.

It is an amenable number.

16126206121 is a deficient number, since it is larger than the sum of its proper divisors (126990).

16126206121 is an frugal number, since it uses more digits than its factorization.

16126206121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253978 (or 126989 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 28.

Adding to 16126206121 its reverse (12160262161), we get a palindrome (28286468282).

The spelling of 16126206121 in words is "sixteen billion, one hundred twenty-six million, two hundred six thousand, one hundred twenty-one".