21230054 has 4 divisors (see below), whose sum is σ = 31845084. Its totient is φ = 10615026.

The previous prime is 21230047. The next prime is 21230123. The reversal of 21230054 is 45003212.

It is a semiprime because it is the product of two primes.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5307512 + ... + 5307515.

It is an arithmetic number, because the mean of its divisors is an integer number (7961271).

Almost surely, 2^21230054 is an apocalyptic number.

21230054 is a deficient number, since it is larger than the sum of its proper divisors (10615030).

21230054 is a wasteful number, since it uses less digits than its factorization.

21230054 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10615029.

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 21230054 is about 4607.6082732802. The cubic root of 21230054 is about 276.8962237296.

Adding to 21230054 its reverse (45003212), we get a palindrome (66233266).

The spelling of 21230054 in words is "twenty-one million, two hundred thirty thousand, fifty-four".