21141111121 has 32 divisors (see below), whose sum is σ = 24584954240. Its totient is φ = 18012201984.

The previous prime is 21141111091. The next prime is 21141111133. The reversal of 21141111121 is 12111114112.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21141111121 - 2²¹ = 21139013969 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21141111095 and 21141111104.

It is not an unprimeable number, because it can be changed into a prime (21141111721) 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, 4596595 + ... + 4601191.

It is an arithmetic number, because the mean of its divisors is an integer number (768279820).

Almost surely, 2^21141111121 is an apocalyptic number.

It is an amenable number.

21141111121 is a deficient number, since it is larger than the sum of its proper divisors (3443843119).

21141111121 is a wasteful number, since it uses less digits than its factorization.

21141111121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5105.

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

Adding to 21141111121 its reverse (12111114112), we get a palindrome (33252225233).

The spelling of 21141111121 in words is "twenty-one billion, one hundred forty-one million, one hundred eleven thousand, one hundred twenty-one".