21455054 has 16 divisors (see below), whose sum is σ = 34909056. Its totient is φ = 9849600.

The previous prime is 21455051. The next prime is 21455059. The reversal of 21455054 is 45055412.

It is a plaindrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21455051) 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, 6302 + ... + 9089.

It is an arithmetic number, because the mean of its divisors is an integer number (2181816).

Almost surely, 2^21455054 is an apocalyptic number.

21455054 is a deficient number, since it is larger than the sum of its proper divisors (13454002).

21455054 is a wasteful number, since it uses less digits than its factorization.

21455054 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15451.

The product of its (nonzero) digits is 4000, while the sum is 26.

The square root of 21455054 is about 4631.9600602769. The cubic root of 21455054 is about 277.8709871849.

The spelling of 21455054 in words is "twenty-one million, four hundred fifty-five thousand, fifty-four".