21054033 has 128 divisors (see below), whose sum is σ = 45158400. Its totient is φ = 9331200.

The previous prime is 21054017. The next prime is 21054037. The reversal of 21054033 is 33045012.

It is not a de Polignac number, because 21054033 - 2⁴ = 21054017 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21053997 and 21054015.

It is not an unprimeable number, because it can be changed into a prime (21054037) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 513493 + ... + 513533.

It is an arithmetic number, because the mean of its divisors is an integer number (352800).

Almost surely, 2^21054033 is an apocalyptic number.

It is an amenable number.

21054033 is an abundant number, since it is smaller than the sum of its proper divisors (24104367).

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

21054033 is a wasteful number, since it uses less digits than its factorization.

21054033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100 (or 94 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 18.

The square root of 21054033 is about 4588.4673911885. The cubic root of 21054033 is about 276.1288387136.

Adding to 21054033 its reverse (33045012), we get a palindrome (54099045).

The spelling of 21054033 in words is "twenty-one million, fifty-four thousand, thirty-three".