16121025531 has 12 divisors (see below), whose sum is σ = 25077151008. Its totient is φ = 9920631024.

The previous prime is 16121025517. The next prime is 16121025577. The reversal of 16121025531 is 13552012161.

16121025531 is a `hidden beast` number, since 1 + 6 + 1 + 2 + 102 + 553 + 1 = 666.

It is not a de Polignac number, because 16121025531 - 2¹⁴ = 16121009147 is a prime.

It is a super-2 number, since 2×16121025531² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 16121025495 and 16121025504.

It is not an unprimeable number, because it can be changed into a prime (16121025581) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 68893155 + ... + 68893388.

It is an arithmetic number, because the mean of its divisors is an integer number (2089762584).

Almost surely, 2^16121025531 is an apocalyptic number.

16121025531 is a deficient number, since it is larger than the sum of its proper divisors (8956125477).

16121025531 is a wasteful number, since it uses less digits than its factorization.

16121025531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137786562 (or 137786559 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 27.

Adding to 16121025531 its reverse (13552012161), we get a palindrome (29673037692).

The spelling of 16121025531 in words is "sixteen billion, one hundred twenty-one million, twenty-five thousand, five hundred thirty-one".