21054016 has 28 divisors (see below), whose sum is σ = 43598592. Its totient is φ = 10068608.

The previous prime is 21053987. The next prime is 21054017. The reversal of 21054016 is 61045012.

It is a junction number, because it is equal to n+sod(n) for n = 21053984 and 21054002.

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 3 ways as a sum of consecutive naturals, for example, 5680 + ... + 8623.

Almost surely, 2^21054016 is an apocalyptic number.

It is an amenable number.

21054016 is an abundant number, since it is smaller than the sum of its proper divisors (22544576).

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

21054016 is a wasteful number, since it uses less digits than its factorization.

21054016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14338 (or 14328 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 21054016 is about 4588.4655387177. The cubic root of 21054016 is about 276.1287643939.

Adding to 21054016 its reverse (61045012), we get a palindrome (82099028).

The spelling of 21054016 in words is "twenty-one million, fifty-four thousand, sixteen".