16121203005431 has 32 divisors (see below), whose sum is σ = 17203587952320. Its totient is φ = 15054313652224.

The previous prime is 16121203005409. The next prime is 16121203005503. The reversal of 16121203005431 is 13450030212161.

It is a cyclic number.

It is not a de Polignac number, because 16121203005431 - 2²² = 16121198811127 is a prime.

It is a super-2 number, since 2×16121203005431² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16121203005394 and 16121203005403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16121203005931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1158708131 + ... + 1158722043.

It is an arithmetic number, because the mean of its divisors is an integer number (537612123510).

Almost surely, 2^{16121203005431} is an apocalyptic number.

16121203005431 is a deficient number, since it is larger than the sum of its proper divisors (1082384946889).

16121203005431 is a wasteful number, since it uses less digits than its factorization.

16121203005431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15235.

The product of its (nonzero) digits is 4320, while the sum is 29.

Adding to 16121203005431 its reverse (13450030212161), we get a palindrome (29571233217592).

The spelling of 16121203005431 in words is "sixteen trillion, one hundred twenty-one billion, two hundred three million, five thousand, four hundred thirty-one".