21111616137 has 4 divisors (see below), whose sum is σ = 28148821520. Its totient is φ = 14074410756.

The previous prime is 21111616051. The next prime is 21111616139. The reversal of 21111616137 is 73161611112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 21111616137 - 2²⁶ = 21044507273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21111616139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3518602687 + ... + 3518602692.

It is an arithmetic number, because the mean of its divisors is an integer number (7037205380).

Almost surely, 2^21111616137 is an apocalyptic number.

It is an amenable number.

21111616137 is a deficient number, since it is larger than the sum of its proper divisors (7037205383).

21111616137 is an equidigital number, since it uses as much as digits as its factorization.

21111616137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7037205382.

The product of its digits is 1512, while the sum is 30.

The spelling of 21111616137 in words is "twenty-one billion, one hundred eleven million, six hundred sixteen thousand, one hundred thirty-seven".