21111054 has 16 divisors (see below), whose sum is σ = 42339792. Its totient is φ = 7017408.

The previous prime is 21111049. The next prime is 21111061. The reversal of 21111054 is 45011112.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2479 + ... + 6954.

It is an arithmetic number, because the mean of its divisors is an integer number (2646237).

Almost surely, 2^21111054 is an apocalyptic number.

21111054 is an abundant number, since it is smaller than the sum of its proper divisors (21228738).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21111054 is a wasteful number, since it uses less digits than its factorization.

21111054 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9811.

The product of its (nonzero) digits is 40, while the sum is 15.

The square root of 21111054 is about 4594.6767024460. The cubic root of 21111054 is about 276.3778955029.

Adding to 21111054 its reverse (45011112), we get a palindrome (66122166).

The spelling of 21111054 in words is "twenty-one million, one hundred eleven thousand, fifty-four".