21111154113 has 8 divisors (see below), whose sum is σ = 32169377728. Its totient is φ = 12063516624.

The previous prime is 21111154079. The next prime is 21111154243. The reversal of 21111154113 is 31145111112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21111154113 - 2³⁰ = 20037412289 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 1005293053 = 21111154113 / (2 + 1 + 1 + 1 + 1 + 1 + 5 + 4 + 1 + 1 + 3).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21111154113.

It is not an unprimeable number, because it can be changed into a prime (21111154613) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 502646506 + ... + 502646547.

It is an arithmetic number, because the mean of its divisors is an integer number (4021172216).

Almost surely, 2^21111154113 is an apocalyptic number.

It is an amenable number.

21111154113 is a deficient number, since it is larger than the sum of its proper divisors (11058223615).

21111154113 is a wasteful number, since it uses less digits than its factorization.

21111154113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1005293063.

The product of its digits is 120, while the sum is 21.

Adding to 21111154113 its reverse (31145111112), we get a palindrome (52256265225).

The spelling of 21111154113 in words is "twenty-one billion, one hundred eleven million, one hundred fifty-four thousand, one hundred thirteen".