16121446431 has 16 divisors (see below), whose sum is σ = 21657310080. Its totient is φ = 10666660320.

The previous prime is 16121446417. The next prime is 16121446433. The reversal of 16121446431 is 13464412161.

It is a de Polignac number, because none of the positive numbers 2^k-16121446431 is a prime.

It is a super-2 number, since 2×16121446431² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 16121446392 and 16121446401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16121446433) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1814941 + ... + 1823801.

It is an arithmetic number, because the mean of its divisors is an integer number (1353581880).

Almost surely, 2^16121446431 is an apocalyptic number.

16121446431 is a deficient number, since it is larger than the sum of its proper divisors (5535863649).

16121446431 is a wasteful number, since it uses less digits than its factorization.

16121446431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13366.

The product of its digits is 13824, while the sum is 33.

Adding to 16121446431 its reverse (13464412161), we get a palindrome (29585858592).

The spelling of 16121446431 in words is "sixteen billion, one hundred twenty-one million, four hundred forty-six thousand, four hundred thirty-one".