21054276 has 48 divisors (see below), whose sum is σ = 54835200. Its totient is φ = 6986016.

The previous prime is 21054263. The next prime is 21054277. The reversal of 21054276 is 67245012.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (21054277) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41110 + ... + 41618.

It is an arithmetic number, because the mean of its divisors is an integer number (1142400).

Almost surely, 2^21054276 is an apocalyptic number.

It is an amenable number.

21054276 is an abundant number, since it is smaller than the sum of its proper divisors (33780924).

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

21054276 is a wasteful number, since it uses less digits than its factorization.

21054276 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 905 (or 897 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 21054276 is about 4588.4938705418. The cubic root of 21054276 is about 276.1299010445.

Adding to 21054276 its reverse (67245012), we get a palindrome (88299288).

The spelling of 21054276 in words is "twenty-one million, fifty-four thousand, two hundred seventy-six".