21054012 has 24 divisors (see below), whose sum is σ = 56144256. Its totient is φ = 6015408.

The previous prime is 21053987. The next prime is 21054017. The reversal of 21054012 is 21045012.

It is a super-2 number, since 2×21054012² = 886542842592288, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21053982 and 21054000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21054017) 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, 125238 + ... + 125405.

It is an arithmetic number, because the mean of its divisors is an integer number (2339344).

Almost surely, 2^21054012 is an apocalyptic number.

It is an amenable number.

21054012 is an abundant number, since it is smaller than the sum of its proper divisors (35090244).

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

21054012 is a wasteful number, since it uses less digits than its factorization.

21054012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250657 (or 250655 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 21054012 is about 4588.4651028421. The cubic root of 21054012 is about 276.1287469069.

Adding to 21054012 its reverse (21045012), we get a palindrome (42099024).

The spelling of 21054012 in words is "twenty-one million, fifty-four thousand, twelve".