21050054 has 8 divisors (see below), whose sum is σ = 32593728. Its totient is φ = 10185480.

The previous prime is 21050053. The next prime is 21050059. The reversal of 21050054 is 45005012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21050053) 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, 169697 + ... + 169820.

It is an arithmetic number, because the mean of its divisors is an integer number (4074216).

Almost surely, 2^21050054 is an apocalyptic number.

21050054 is a deficient number, since it is larger than the sum of its proper divisors (11543674).

21050054 is a wasteful number, since it uses less digits than its factorization.

21050054 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 339550.

The product of its (nonzero) digits is 200, while the sum is 17.

The square root of 21050054 is about 4588.0337836594. The cubic root of 21050054 is about 276.1114424287. Note that the first 3 decimals are identical.

Adding to 21050054 its reverse (45005012), we get a palindrome (66055066).

The spelling of 21050054 in words is "twenty-one million, fifty thousand, fifty-four".