21054036 has 24 divisors (see below), whose sum is σ = 50454880. Its totient is φ = 6828192.

The previous prime is 21054017. The next prime is 21054037. The reversal of 21054036 is 63045012.

It is a happy number.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 23266 + ... + 24153.

Almost surely, 2^21054036 is an apocalyptic number.

It is an amenable number.

21054036 is an abundant number, since it is smaller than the sum of its proper divisors (29400844).

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

21054036 is a wasteful number, since it uses less digits than its factorization.

21054036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47463 (or 47461 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 21054036 is about 4588.4677180950. The cubic root of 21054036 is about 276.1288518289.

Adding to 21054036 its reverse (63045012), we get a palindrome (84099048).

The spelling of 21054036 in words is "twenty-one million, fifty-four thousand, thirty-six".