21131054 has 24 divisors (see below), whose sum is σ = 37059120. Its totient is φ = 9010176.

The previous prime is 21131041. The next prime is 21131069. The reversal of 21131054 is 45013112.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24767 + ... + 25605.

It is an arithmetic number, because the mean of its divisors is an integer number (1544130).

Almost surely, 2^21131054 is an apocalyptic number.

21131054 is a deficient number, since it is larger than the sum of its proper divisors (15928066).

21131054 is a wasteful number, since it uses less digits than its factorization.

21131054 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1112 (or 1105 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 21131054 is about 4596.8526189122. The cubic root of 21131054 is about 276.4651454223.

Adding to 21131054 its reverse (45013112), we get a palindrome (66144166).

The spelling of 21131054 in words is "twenty-one million, one hundred thirty-one thousand, fifty-four".