21111145311 has 32 divisors (see below), whose sum is σ = 28677369600. Its totient is φ = 13812780800.

The previous prime is 21111145301. The next prime is 21111145331. The reversal of 21111145311 is 11354111112.

It is a cyclic number.

It is not a de Polignac number, because 21111145311 - 2⁶ = 21111145247 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21111145301) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16453876 + ... + 16455158.

It is an arithmetic number, because the mean of its divisors is an integer number (896167800).

Almost surely, 2^21111145311 is an apocalyptic number.

21111145311 is a deficient number, since it is larger than the sum of its proper divisors (7566224289).

21111145311 is a wasteful number, since it uses less digits than its factorization.

21111145311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1847.

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

Adding to 21111145311 its reverse (11354111112), we get a palindrome (32465256423).

The spelling of 21111145311 in words is "twenty-one billion, one hundred eleven million, one hundred forty-five thousand, three hundred eleven".