16121311 has 2 divisors, whose sum is σ = 16121312. Its totient is φ = 16121310.

The previous prime is 16121309. The next prime is 16121341. The reversal of 16121311 is 11312161.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16121311 - 2¹ = 16121309 is a prime.

Together with 16121309, it forms a pair of twin primes.

It is equal to p_1038400 and since 16121311 and 1038400 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16121341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8060655 + 8060656.

It is an arithmetic number, because the mean of its divisors is an integer number (8060656).

Almost surely, 2^16121311 is an apocalyptic number.

16121311 is a deficient number, since it is larger than the sum of its proper divisors (1).

16121311 is an equidigital number, since it uses as much as digits as its factorization.

16121311 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36, while the sum is 16.

The square root of 16121311 is about 4015.1352405616. The cubic root of 16121311 is about 252.6194500672.

Adding to 16121311 its reverse (11312161), we get a palindrome (27433472).

The spelling of 16121311 in words is "sixteen million, one hundred twenty-one thousand, three hundred eleven".